• Sky Watching

    There’s a sunrise and a sunset every single day, and they’re absolutely free. Don’t miss so many of them.

    ~Jo Walton

    I had a trip to Pocosin Lakes and Mattamuskeet National Wildlife Refuges with a great group this past weekend. The birds have arrived (well, maybe not all the birds as yet) and it was a beautiful weekend of clear skies and warm weather. Too warm for my tastes, but I don’t think my friends minded. In addition to the wildlife, we enjoyed some beautiful skies, especially at sunrise and sunset. While almost everyone I know appreciates a good sunset, I find that many people are not fond of the concept of sunrise. A teacher that attended one of our Yellowstone workshops one summer (when sunrises are really early) sent me a cartoon whose caption summed up her feelings…the only problem with sunrise is that it comes too damned early.

    sunrise Lake Mattamuskeet from platform 1
    Just before sunrise at Lake Mattamuskeet (click photos to enlarge)

    To make it even tougher for the dawn-weary, the 15-30 minutes just before sunrise are often the most spectacular in terms of color. Such was the case Saturday at Lake Mattamuskeet. The usual spot for viewing the sunrise is the observation platform along the causeway (Hwy 94) over the lake. From that location, a small island of cypress trees provides a nice added element in any photograph. In fact, I think this may be the most photographed “island” in the state of North Carolina, based on the many entries in the annual Wildlife in NC Photo Competition that include this photogenic group of trees.

    sunrie Mattamuskeet
    Getting closer to sun popping up

    As the sun started to peek above the horizon, the colors had subsided, and more clouds became visible in the eastern sky.

    rising sun on lake mattamuskeet
    Telephoto sunrise

    Switching to my Canon 7D MII and a telephoto lens created a much different perspective on the orange orb coming over the distant trees. But, from what I have read, the actual sun may not quite be up in this photograph. Say what? Due to the bending of light (refraction) in the Earth’s atmosphere, we see the sun in a position slightly different from where it really is. If I understand this correctly, this effect means that we “see the sun” about two minutes before the actual position of the sun is above the horizon.

    Sunset north shore of Mattamuskeet
    Sunset along the north shore

    Back to just appreciating the sky…After a full day of wildlife watching, we headed back to Belhaven in late afternoon. Cruising along the north shore of the lake we passed a perfect spot for a quick stop to appreciate the final light of the day, as watched by us and a lone Bald Cypress tree.

    OLYMPUS DIGITAL CAMERA
    Ground fog and dawn light at the Pungo Unit

    The next morning we were at the Pungo Unit of Pocosin Lakes National Wildlife Refuge. My car arrived first, and two of us got out and viewed the horizon as we waited for the remaining folks. The sky was on fire and had the added beauty of a thin layer of morning fog hanging just above the ground. This type of fog is often called radiation fog. On clear, calm nights, especially in fall and winter, the land cools after sunset by radiating heat upward into the sky. This causes condensation in the air above the cooling ground. Under calm conditions, the fog will often form a thin layer just above the ground. This type of fog usually dissipates shortly after sunrise as the ground warms back up.

    OLYMPUS DIGITAL CAMERA
    Wide view from the corn field

    The striking colors of the the sky on this trip had me wondering,,,why do winter sunrises and sunsets seem so much more intense? A quick online search produced this confirming statement in one scientific article In the middle latitudes and over the eastern half of the United States, fall and winter generally produce the most spectacular low-sun hues. In general, sunsets and sunrises tend to be more colorful because of something called Rayleigh Scattering. That is because air molecules tend to absorb and radiate (scatter) the shorter wavelengths of incoming light best. Since blue and violet are the shorter wavelengths in the sun’s spectrum of light, those colors are scattered in all directions first, which is why we see the daytime sky as blue.

    During sunrise and sunset, sunlight must pass through more of our atmosphere before reaching us, so it comes into contact with more air molecules and particulates such as dust. This longer path causes even more of the shorter wavelengths of blue light to be scattered from the incoming beam. That means that more of the longer wavelengths reach our eyes, resulting in a red or orange tinted sky. In colder months, the air tends to be dry and clear with fewer particles. That means more colors of the spectrum make it through to our eyes, resulting in more vivid colors early and late in the day.

    sunrise Pungo over field
    Tree silhouette at dawn

    While I find all of this interesting, for me, the beauty of a winter sunrise or sunset is enough reason to be outside to watch them. And I must admit, sunrise is my favorite time of day. It is usually the quietest time since most of the world is still asleep, or at least still inside. It is a good time to think and to reflect on the importance of the simple fact of being alive to greet another day. It is also a humbling experience, especially when viewed in the big sky country of Eastern North Carolina, or out West, in places like my beloved Yellowstone. So, give yourself (and others, if they are willing) a gift of sky watching this holiday season. It is simple, really. Make time to get outside at the right time of day, take a deep breath, and enjoy. I especially encourage the gift of a sunrise with the addition of a warm coat and a steaming mug of your favorite morning beverage. You won’t regret it.

  • Web Design

    Each of us is a unique strand in the intricate web of life and here to make a contribution.

    ~Deepak Chopra

    It seems like all of nature can make a contribution to our well-being, often in surprising ways.

    sheet web in fog
    Sheet webs adorned the woods this week (click photos to enlarge)

    I awoke on two mornings this week to dense fog here in the woods. The fog revealed the presence of a variety of spiders that have survived well past their usual expiration date.

    web in fog
    This one looks similar to a Bowl and Doily Spider web

    A stroll through the yard showed many sheet webs on the ground and a few of what looked like Bowl and Doily Spider webs.

    silk strands on foggy morning 1
    Shimmering strands of silk adorned many twigs

    There were also some random strands of silk draped on twigs and old flower stalks.

    Orb web on foggy morning
    An orb web sparkles with water droplets

    I always enjoy seeing orb webs decorated in dew drops and finally found one strung between twigs on a sapling. It always reminds me of necklaces of circular diamonds due to the regular pattern of droplets. That got me to wondering…why is there such a seemingly regular array of water droplets on spider webs?

    Orb web on foggy morning closeup
    Water droplets seem to appear in a regular formation on spider webs

    A quick online search this morning lead me to some interesting studies. A blog in Discover magazine reported on some studies by Chinese scientists that found that protein fibers in the silk of one species of spider change structure in response to water. When in contact with humidity, like on the foggy mornings this week, certain areas of spider silk fiber scrunch up, forming tiny knots along the strand. In between these knots are smooth areas of the fiber which allow condensed water to slide along until it hits a knot, where it accumulates into a droplet. The researchers were able to copy the fiber structure and created artificial strands that mimic the water gathering properties of the spider silk.

    silk strands on foggy morning
    Water droplets form jewel-like patterns on spider silk

    The scientists hope that these artificial spider strands may have industrial uses or could be used to help gather drinking water from the air in dry areas of the world. While they were able to figure out how this water collection occurs on the spider silk, they don’t have a reason why silk strands behave in this way (what’s in it for the spider?). It seems that wet silk strands are less effective at catching prey. They speculated that by forming droplets that eventually fall off the web as they grow, this property could help keep a web from getting too heavy and being damaged by the weight of the accumulating water. Or, perhaps it is just one of nature’s ways of bringing beauty into our world and helping us appreciate the simple things in life.

  • Deciphering Diets

    …during reproduction, arguably the most important weeks of a bird’s life, 96% of North American terrestrial birds eat insects and other arthropods.

    ~Doug Tallamy

    _-11
    Prothonotary Warbler with a beak-full of bugs (click photos to enlarge)

    During our recent bout of wet weather, I finally managed to do something that has been on my to-do list for awhile – upload images to a citizen science project called What Do Birds Eat? This is a fascinating effort to learn more about what arthropod species are being eaten by North American birds, especially during nesting cycles. The creator of the site, Dr. Doug Tallamy, is well-known as one of the gurus of the native plants movement from his book, Bringing Nature Home – How Native Plants Sustain Wildlife in Our Gardens.  He is also a professor and Chair of Entomology and Wildlife Ecology at the University of Delaware. One of the key selling points for landowners to plant native plants is that they support a more diverse suite of native insects, which, in turn, help support our native birds. But, as Tallamy points out, we know very little about the specifics of what birds eat, even our common backyard species. So, he created a site to crowd-source photos of birds with insects in their beaks. He and other entomologists will then try to identify the prey and record it on a searchable database. This should be a very interesting project. Below are some of the images I uploaded this week. All but the bittern were adult birds bringing food to nestlings. If any of you have images of birds eating arthropods, I encourage you to submit them to the What Do Birds Eat data entry site…definitely a worthwhile rainy day project.

    Louisiana Waterthrush dancing
    Louisiana Waterthrush with a mouthful of mayflies
    _-19
    American Bittern with what looks like a Giant Water Bug
    _-5
    Carolina Wren with Daddy-Long-Legs
    Brown Thrasher at sunset 1
    Brown Thrasher with nymph of Periodical Cicada
    _-18
    Eastern Phoebe with Soldier Beetles
    Yellow-throated Vireo and young
    Yellow-throated Vireo with a moth
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    Eastern Bluebird with cricket
    Male Bluebird with grub
    Eastern Bluebird with beetle grub
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    Carolina Chickadee with caterpillar
  • Stinkhorn

    ..And you, whose pastime is to make midnight mushrooms…

    ~William Shakespeare’s The Tempest

    I debated posting this one, for obvious reasons, but, it is just too weird not to post. Over the holidays, I was asked about a strange-looking mushroom growing in the mulch alongside a home. The description left no doubt in my mind – one of the stinkhorn fungi.

    Stinkhorn fungus 1
    Stinkhorn fungus growing in mulch (click photos to enlarge)

    Stinkhorns are an amazing and strange group of fungi, most are in the family, Phallaceae (again, for obvious reasons). Although there are several genera representing a wide range of strange shapes, they all share some common traits: the fruiting body (mushroom) arises from a globular “egg” that can often be seen protruding from the ground at the base of the mushroom; and, unlike most fungi that rely on wind to disperse their spores, members of this family produce a foul-smelling slime which attracts insects that help disperse the spores (note the small fly on the top edge of the white tip) in the first photo.

    Stinkhorn fungus with scale
    These large fungi can appear overnight, and disappear almost as quickly

    Anytime one of these weird fungi pops up in someone’s yard, they inevitably create a lot of curiosity and reaction in the homeowner. A publication by Clemson Cooperative Extension perhaps summarizes it best...Mycologists (scientists who study fungi) often describe stinkhorns with adjectives such as amazing, interesting or unique. However, homeowners lucky enough to have these aromatic mushrooms suddenly appear in the yard just before an outdoor party will often describe them as disgusting, shocking, foul-smelling or simply gross. To make things worse (in terms of appreciating these unusual life forms), the slime that is produced to attract insects often smells like dog poop or a rotting carcass. Not very pleasing to us, but apparently very effective in attracting a host of flies, beetles, and other insects that typically come to clean up the nasties in our environment.

    Stinkhorn fungus closeup
    Texture of the cap helps to identify this to species

    Looking at various online mycology resources, I think this one may be Phallus ravenelii, the Common Stinkhorn, or Ravenel’s Stinkhorn. This species tends to have a smooth or slightly rough texture on the cap compared to some other species with deeply pitted caps. They all are saprophytes, feeding on decaying organic matter, especially wood (hence their fondness for mulch piles). This species is found in the eastern United States and and the fruiting body usually occurs from late summer into autumn.

    Stinkhorn dog fungus
    Elegant (or Dog) Stinkhorn

    Another common stinkhorn variety I have photographed in the past is the Elegant, or Dog Stinkhorn, Mutinus elegans (or caninus ). It has another strange shape that might cause an embarrassed chuckle in an observer. But, stinkhorns have evoked a lot of other emotions in the past. I read that Darwin’s daughter had a particular hatred of certain stinkhorns. According to a Cornell blog about this story, she had such a disdain for them that she would go out on forays into the woods, looking and sniffing, until she found one. She then would poke the offending fungus with a pointed stick and put it into a basket she carried for the purpose. At the end of the day, the catch was brought back and burnt in the deepest secrecy on the drawing room fire with the door locked because of the morals of the maids.

    Well now….I (somewhat shamefully) admit that when I am hiking along a woodland trail and catch a whiff of that smell, I look around with excitement to see which one of these strange mushrooms might be lurking nearby. They are always an amazing discovery. So, if you should find yourself in the company of one these bizarre fungi, stop and take a closer look, and marvel at nature’s strangeness and adaptability (just don’t let the neighbors see you).

     

  • Opting Out

    I cannot endure to waste anything so precious as autumnal sunshine by staying in the house.

    ~Nathaniel Hawthorne

    Swift Creek Reservoir VA
    Sunrise on Opt Out Friday (click photos to enlarge)

    If Nathaniel had lived in our times, he might have added something to that sentiment….or by going shopping, especially on Black Friday. I think outdoor retailer REI made a huge splash with their decision to encourage people to go outside over Thanksgiving and Black Friday, and by closing their stores to allow their employees to do the same. I was trying to remember if I have ever gone shopping on Black Friday…I don’t think so. And with the publicity of #optoutfriday, I think many more people did what so many of us have done in the past, get outside with family and friends over the Thanksgiving holiday. This year’s weather was especially conducive to such activities. After visiting my folks in the mountains, we traveled to Richmond to spend the remainder of the holiday with Melissa’s family. They live adjacent to a large reservoir bordered by a thin conservation buffer.

    Swift Creek Reservoir VA 1
    Sunrise at Swift Creek Reservoir near Richmond, VA

    I like to get up early and walk around the lake shore, enjoying the sights and sounds (in spite of the frequent gun shots from some nearby duck hunters this past weekend). There is something magical about being up early when few people are out, when the natural world is starting to stir. The glowing quality of the morning light is especially pleasing when a very light mist hangs over the water.

    Beaver Lake, Pocahontas State Park, VA
    Beaver Lake, Pocahontas State Park, VA

    After breakfast we all headed over to nearby Pocahontas State Park, an 8000+ acre forested preserve with some nice creeks, a marshy pond, and a large lake. The warm weather created ideal conditions for some end of the season wildlife sightings.

    Brown Snake
    Brown Snake

    With morning temperatures in the mid-60’s, it seemed more like late summer than Thanksgiving. The day before we had spotted a very active late season snake, a Brown Snake, Storeria dekayi, at another nearby park. Brown Snakes are common in forested areas but are often missed because they tend to move about under leaf litter and logs in search of their favorite prey, earthworms. This one was caught as it crossed the trail. A quick portrait and it was released back into the leaves. I was hoping for some other late season surprises on this hike.

    Autumn Meadowhawk dragonfly
    Autumn Meadowhawk dragonfly

    Down by the water’s edge at Beaver Lake, we saw a couple of small dragonflies darting about. One landed briefly on the dock railing and I managed a quick pic with my point and shoot Olympus. I thought it was a species I had photographed earlier back home, a Blue-faced Meadowhawk, but, in looking at the field guides later, I think this is a different species, an Autumn Meadowhawk, Sympetrum vicinum. There is little black on the abdomen and the legs look light in color, which separate this species from the other. Plus, field guides say this is one of the latest-flying of our dragonflies. The hike continued with sightings of several other insects and spiders enjoying this autumn warmth, as well as some nice birds, including a Red-headed Woodpecker feeding on acorns.

    Eastern Tiger Swallowtail chrysalis
    Swallowtail chrysalis on tree trunk

    Toward the end of the hike we started playing a nature nerd game we often do while walking in the woods…trying to identify trees just by their trunk and bark. Along a boardwalk near the lake edge I walked up and tapped a trunk and asked for an identification. Melissa quickly gave an answer (an ash) and then pointed to something right above where I had tapped (something I failed to notice, I’m ashamed to say) – a chrysalis. The overall shape, plus the way it was connected to the trunk (via a silk loop around the upper third of the body with its posterior end connected directly to the trunk) told me it was a swallowtail chrysalis…but which one?

    Close up of Eastern Tiger Swallowtail chrysalis
    Close up of Eastern Tiger Swallowtail chrysalis

    Looking around the habitat, I could see two possibilities based on the available host plants – a Spicebush Swallowtail (some Spicebush were nearby in the low area adjacent to the boardwalk), and an Eastern Tiger Swallowtail (several Tulip Poplars were along the trail). I have raised plenty of Spicebush Swallowtails from the larval stage, and this chrysalis looked different in both color and texture (those of a Spicebush Swallowtail are generally light brown and sleek-looking). When I got home, I looked online and confirmed that it probably was a chrysalis of an Eastern Tiger Swallowtail. The color can be variable but they often have a mixture of green and brown which makes it look like they are a broken twig covered in small patches of lichen. An impressive camouflage. And a morning well spent, to be sure. I hope all of you had a chance to get outside this holiday and enjoy the bargains that nature brings to us every day.

     

  • Thankful for Public Lands

    Life wants you to have gratitude for the gift of living.  Treasure every second.

    ~ Bryant McGill

    I am a believer in the value of our public lands. I worked for the North Carolina Division of Parks and Recreation the first 8 years of my career and am still a supporter of that fine organization and what they do to preserve the best of the wild places in our state. And, as readers of this blog know, my favorite place to visit is Yellowstone National Park, the world’s first national park. I usually vacation in areas with public lands and my guided trips are usually to public lands, especially our wildlife refuges. Recently I gave two programs to local photography groups on our national wildlife refuges, highlighting Mattamuskeet and Pocosin Lakes National Wildlife Refuges (NWR), in the hopes that the audience will become visitors and supporters of the refuge system. So, of course, when I recently decided to take a few days and travel to some interesting places, it made sense for me to visit national wildlife refuges. I was debating whether to go south or north, but with the recent warm weather and rains, I decided south (where temperatures were predicted to be in the 80’s) might not be to my liking and the mosquitoes would have to feed on someone else, so north I went.

    Chincoteague sunset
    Chincoteague sunset (click photos to enlarge)

    I drove first to Chincoteague NWR. I reported on some of the birds I saw in two previous posts, but there were several other species as well as some beautiful sunrises and sunsets.

    Double-crested Cormorant resting
    Double-crested Cormorant resting on tree limb
    Great egret in shade
    Great Egret with morning sun and shade
    Great egret preening 1
    Great Egret scratching an itch
    Great egret preening 3
    Great Egret preening

    Great Egrets and Double-crested Cormorants provided some photographic subjects as they rested and preened a;long roadside canals. But, there were not that many waterfowl as yet, so I headed further afield and drove over to Blackwater NWR one afternoon from Chincoteague.

    Mallards at Blackwater NEWR
    Mallards at Blackwater NWR

    Birds were not very common there either, but I did see a few ducks, lots of Canada Geese, and the soon-to-be de-listed Delmarva Fox Squirrel.

    Delmarva Fox Squirrel at Blackwater NWR
    Delmarva Fox Squirrel

    While on the trip, I heard this huge tree squirrel will be taken off the endangered species list next month due to the recovery of its population. Good news!

    Blackwater VC
    Visitor Center at Blackwater NWR

    One thing that really impressed me at Blackwater NWR were the facilities. The visitor center is beautiful, complete with a well-interpreted native plant garden out back. I had a chance to chat with two of the people in the gift shop (both volunteers) and learned that much of what I saw was donated by the efforts of the Friends of Blackwater NWR, a non-profit support group. They have been very creative in fund-raising and support for the refuge and it really has paid off. I encourage everyone to consider joining a Friends group for any of the refuges that you regularly visit. Your voice and your financial support go a long way, especially in these tough budget times.

    Snow Geese at Bombay Hook
    At last, Snow Geese!

    Driving farther north, I had planned to spend a night in the vicinity of Bombay Hook NWR, figuring there should be some Snow Geese and other waterfowl. There were finally some Snow Geese, maybe 5000, but much of the refuge was closed for the weekend for one of their annual deer hunts. Unfortunately, I had missed that information when I checked the web site (it was posted at the bottom of the first page of the web site and I missed it going through the tabs at the top of the page). Lesson learned – when planning a visit to a wildlife refuge, be sure to check for restrictions and closures during hunting seasons. With limited access, at refuges up north I decided to head back to my home state and see what might be happening.

    Dunlin at Pea Island
    Dunlin at Pea Island NWR
    Dowitcher at Pea Island
    Short-billed Dowitcher grabs a minnow for breakfast

    Sunrise at Pea Island NWR had a beautiful 6-point buck crossing north pond (and me with my camera still packed in the back, oh well, it was still beautiful to see). A flock of Dunlins and Dowitchers were feeding along the edge of the pond and allowed me some shots from the roadside.

    American Bittern at Mattamuskeet
    American Bittern near Mattamuskeet NWR
    Gray fox on wildlife driver
    Gray Fox on Wildlife Drive

    On to Mattamuskeet which had some Tundra Swans and a few ducks, along with the eagle I posted about earlier. There was also an American Bittern out in the open in someone’s front yard right next to the road…not your usual spot for a bittern. And, it looks as though it will be another good year for Gray Foxes along Wildlife Drive as I saw two in my short time on the refuge.

    Bear road
    Bears coming out at sunset on an overcast day

    My last stop on my way home was my old favorite, Pocosin Lakes NWR. A few swans flying, some ducks at sunset, and, of course, a few bears along “bear road”. Looks like another busy winter coming up. If you have a chance, get out this week to some public lands near you, and be thankful for the vision of those that helped establish these wonderful wildlife habitats and sanctuaries for our spirits, and for those that work to maintain them for us all.

     

     

  • An Eye for Eagles

    Its soaring flight, with its pure white head and tail glistening in the sunlight, is really inspiring; and it adds grandeur to the scene as it sits in a dignified pose on some dead tree, its white head clearly visible against the dark green of the forest background.

    ~Arthur Cleveland Bent, 1937

    Interestingly, the famed ornithologist quoted above also had this to say abut our national bird…“On June 20, 1782, our forefathers adopted as our national emblem the bald eagle, or the “American eagle” as it was called, a fine looking bird, but one hardly worthy of the distinction. Its carrion-feeding habits, its timid and cowardly behavior, and its predatory attacks on the smaller and weaker osprey hardly inspire respect and certainly do not exemplify the best in American character.” He also was not in favor of Benjamin Franklin’s preference for the Wild Turkey as our national symbol saying “such a vain and pompous fowl would have been a worse choice.” A Golden Eagle would have satisfied him, being a “far nobler bird”, but, as it is not strictly American, it would not qualify. So, in spite of its perceived character failings, Bent conceded that the Bald Eagle is at least a majestic looking bird. I agree, majestic, indeed. And, in spite of the scarcity of waterfowl on my recent circuit through the wildlife refuges of nearby states, I was greeted at every one of them by at least one Bald Eagle,  Haliaeetus leucocephalus.

    Eagle nest location
    Site of eagle nest along the Wildlife Loop at Chicncoteague NWR (click photos to enlarge)

    The best views were at Chincoteague National Wildlife Refuge in Virginia. On my last trip there, two years ago, I saw eagles near their nest site in a small grove of trees adjacent to the Wildlife Loop on the refuge.

    Bald Eagle nest
    Pair of Bald Eagles sitting on nest

    The nest is apparently still being used. Two adult birds were sitting in it, barely visible if you didn’t know where to look. The huge stick nest sits in a large pine less than 100 yards from a popular trail and is easily visible by the thousands of visitors that walk, cycle, and drive (cars are allowed on the loop after 3 p.m.) the loop each year. The refuge also has an eagle cam in their visitor center which provides lots of information and updates on the status of the nest. I believe this nest has been in use since 2012, when the previous one fell during the winds of Hurricane Sandy. Eagle nests tend to be used year after year, with more material added each year. This can lead to huge nests over time. A typical Bald Eagle nest is 4 to 5 feet in diameter and 2 to 4 feet deep. The largest Bald Eagle nest on record, located in St. Petersburg, Florida, was 9.5 feet in diameter, 20 feet deep and weighed almost 3 tons. That nest holds the record as the largest nest in the world built by a single pair of birds.

    Bald Eagle on snag
    An adult Bald Eagle poses nicely on a dead snag near its nest

    On my second morning at Chincoteague, I was rewarded with one of the eagles perched out in the open near the nest. It was a classic perch, a tall, lone dead pine, a perfect place to survey your world if you are an eagle. I set up my tripod, put on the 500mm with a 1.4 teleconverter, and shot way too many shots as the eagle watched the comings and goings of ducks, ibis, and various other birds.

    Bald Eagle stretch
    The eagle stretched as if to fly (these images cropped compared to previous one)

    At one point, the eagle leaned forward and stretched out. I thought it might launch itself into the air, a shot I would love to capture.

    Bald Eagle scratching
    Bald Eagle scratching

    But, it was merely to get at an itch. The eagle leaned back and brought up its formidable talons to delicately scratch its face.

    Bald Eagle scratching 1
    Impressive talons stretched out to scratch

    The talons can be used for a delicate operation like preening feathers, or for killing the eagle’s prey. According to the web site of the National Eagle Center, the crushing strength of each talon is estimated to be at least 400 pounds per square inch (psi). That is at least ten times stronger than the average grip strength of between 20 to 40 psi for a human hand. The talons on a female eagle are longer than those on a male (females are larger in general). The hind toe (hallux) has the longest talon and may be almost two inches long on a large female.

    Bald Eagle on snag 1
    Regaining the royal pose after a scratch

    Another notable feature of a perched Bald Eagle is its impressive beak. Like the talons, the beak is made of keratin (similar to our fingernails). And its hooked tip and large size relative to the head size is an identifying feature for eagles even in poor light or at great distances (relative to vultures and some other large birds that people might confuse with eagles).

    Bald Eagle head
    Bald Eagle head (heavily cropped image)

    Of course, the eyes of an eagle are one of its most impressive features. They are almost the same size (weight) as a human eye, even though an adult eagle might weigh only 14 pounds. Obviously, an eagle’s eyes take up a large proportion of its skull compared to ours. No one knows exactly how much better an eagle can see than us, but there have been some comparisons. Rod and cone cells on the retina send sight information to the brain. A human eye has about 200,000 cones per millimeter in a concentrated area on the retina. A Bald Eagle has a much higher concentration of about one million cones per millimeter. An online search showed a range of estimate that an eagle has anywhere from 4 to 8 times the visual acuity of a person.

    Bald Eagle at Mattamuskeet
    Last Bald Eagle of my refuge trip (at Mattamuskeet NWR)

    I probably observed over twenty Bald Eagles on this trip, stopping to enjoy each sighting. I guess I must respectfully disagree with Mr. Bent in his assessment of our national bird. It is always a thrill to see one, and my recent tour of refuges showed that eagles are doing well here in the East. In fact, Bald Eagle populations nationwide have recovered enough that they were officially removed from the endangered species list in 2007. Back in 1963, the all-time low population of Bald Eagles in the lower 48 of the United States was estimated at 487 nesting pairs. When they were delisted, eagle populations had soared to an estimated 9789 nesting pairs in the lower 48. One recent estimate put the total population (not just nesting pairs) of eagles in North America (including Alaska and Canada) at 69,000. They are now being celebrated in many areas with eagle festivals, eagle-watching tours, and eagle nest cams. For me, the delight comes from seeing one perched in a tree, looking out over the terrain, searching for prey, and then lifting off with powerful wing beats into a blue sky. I, for one, am glad they are back.

  • Say Ahh…

    I wake up in the morning and I say Ahh! Today’s the day for a song!

    ~Brian Wilson, the Beach Boys

    I went on a rambling road trip last week to search for some migrating waterfowl and shoot a few images of something other than the weird bugs and fungi I have photographed recently (not that there’s anything wrong with that:) I started my quest at Chincoteague National Wildlife Refuge in Virginia. I drove out next to the beach at sunset and found several gulls resting in the late afternoon sunshine. One immature gull was perched on a sign post next to the parking lot.

    gull with open bill
    Young gull opens it bill and says ahh (click photos to enlarge)

    As I pulled up, the bird gave me the… well, an apparent opinion on my presence, or was it? It opened its beak wide, closed it, and repeated. Another car came by and my friend flew off leaving me wondering about this behavior. I have seen it before, especially in gulls…a repeated opening and closing of the beak while seemingly resting on the beach.

    gull in late afternoon sun
    Gull in late afternoon light enjoying a puddle

    I found another group of gulls just down the beach that were enjoying a late afternoon bath in a freshwater pool in the sand. I shot a few pictures out the window, and then…

    gull with open bill 1
    Another gull gaping in the golden light

    …another gape. So, is it me? Am I that boring? Is it a yawn? An online search that evening yielded little in terms of an explanation. When searching about birds using the term, “gape”, which to me means to open wide, the discussion was instead on the technical term relating to a part of a bird’s anatomy. The gape is the interior of the open mouth of a bird. It is common for the young of many species of birds to have brightly colored gapes which is believed to induce feeding by parent birds. When I googled gulls opening and closing their beak rapidly, I got things like threat displays of some birds, begging for food by young (and, in some species, females that are being wooed by a male), and the possibility of something being stuck in the throat of the bird with mouth ajar. There is even a parasitic nematode that irritates the trachea of an infected bird causing a disease known as “the gapes”. But, it seems like that is more prevalent in young poultry and pheasants.

    gull with open bill 2
    With their beak wide open, you can see how a gull can swallow large objects

    So, I guess I am still unclear as to why the gulls are doing this. The light was fading, and as I started to head back to the hotel I noticed a Royal Tern sitting atop a low dune.

    tern with open bill
    Royal Tern sighing after a long day on the wing

    As I pulled up…yup, he gave me the gape. Maybe I am overthinking this, and it really is just a sigh of relief, or a yawn, after a long hard day. If I check, they are probably doing the same thing on Monday mornings. I think I remember seeing that in some of my human counterparts back at the museum.

  • Celebrate America’s Best Idea with a Trip to Yellowstone in June!

    Sky with Clepsydra Geyser
    Clepsydra Geyser (click photos to enlarge)

    Join me, June 2-9, 2016, for an unforgettable experience in the world’s first national park, Yellowstone! Next summer will mark 100 years since the creation of the National Park Service, and there is no better way to celebrate than by visiting Yellowstone. We will spend our days exploring Yellowstone’s unique thermal areas, beautiful landscapes, and wildlife-rich valleys. I offer small group (4 to 6 participants) field experiences that take you beyond the typical roadside views of this incredible park. Visit my Trips page for more information and to request a registration form. Space is limited. Previous blogs from Yellowstone trips can give you an idea of the wonder and beauty you will experience.

    Here are a few images from last year’s trip…

    Rocky Mountain Goat
    Rocky Mountain Goat in the Beartooths
    Great Gray Owl female
    Great Gray Owl
    Clouds at sunset along Slough Creek
    Beautiful sky over Slough Creek
    Bison calf out car window
    Bison calf from the car window
    Pronghorn doe at sunrise
    Pronghorn doe at sunrise
    Double rainbow in Hayden Valley 1
    Double rainbow in Hayden Valley
  • Eye Shadow

    They are of a most glorious Green, and very tame. There are several other Colours of these Lizards; but none so beautiful as the green ones are.

    ~John Lawson, in A New Voyage to Carolina, 1709

    I went for a walk in the yard earlier this week, looking for anything that might be out and about in this wet and warm weather. There are still a lot of insects and spiders that are hanging on as we have not had a truly killing frost as yet. Brushing up against some hickory saplings growing inside the deer fence (there are none outside the fence), I caught a slight movement.

    Carolina Anole in rain whole body
    Green Anole on a misty day in autumn (click photos to enlarge)

    It was a Green Anole, Anolis carolinensis. Well, in name it is green, but that day, it was brown. As you probably are aware, the Green Anole has the ability to completely change colors in just a few minutes. You may hear that it is so they can match their green or brown background. And many people call them “chameleons”. But, they are not a true chameleon and are more closely related to iguanas. And, their color changing behavior is much more complex than simple camouflage.

    Green anole
    Green Anoles can vary in color from brown to green

    I found an older photo of an anole from the summer months and posted it above to show how bright green they can appear.

    Carolina Anole in rain 1
    The anole was mostly brown with some lighter colors around the eyes

    The one this week was almost all brown, except for the scales around its eyes. It was a misty morning with temperatures in the 60’s, but the dampness made it seem cooler, so I was a little surprised to see one out. Even so, this one was moving slowly.

    Carolina Anole in rain
    Water droplets on the back of an anole

    As it climbed over the top of some yellow leaves, I could see the tiny jewel-like water droplets beaded up on its back.

    Carolina Anole in rain head shot

    It moved to another leaf, which bent down with the weight of the tiny dinosaur, before the lizard popped its head back up to make sure I wasn’t getting any closer. That’s when the eye shadow really struck me.

    Carolina Anole in rain head shot from side close up

    Though subtle, the blues, greens, and yellows stood out against the soft brown of the other scales on the head.

    Carolina Anole in rain head shot with yellow leaves close up
    As I watched, the colors around the eye slowly faded

    The photo above was taken about 6 minutes after the previous one. I have observed in the past a similar color change in the entire body of a Green Anole. This rapid color change has fascinated the public and scientists for a long time. Perhaps, because of this interest, and the relative ease of keeping this species in the lab, physiological color change has apparently been studied more thoroughly in Anolis carolinensis than in any other vertebrate. So, how do they do it, and why? That turns out to be a bit complicated, at least as far as I can comprehend.

    Carolina Anole in rain head shot looking straight on
    Color change is complicated

    After reading several online resources, the best I can come up with is that the color change arises from light reflecting through the epidermis onto three layers of pigmented cells, called chromatophores, with each layer having a different name and being responsible for different color variations. From nearest the skin surface moving downward, the layers are one for blue (which technically has stacks of platelets that reflect blue-green light, instead of blue pigments), one for yellow (yellow and blue equals green), and one for brown. The lizards are able to change color in response to many factors including temperature, stress, and various other behavioral (especially social interactions) and environmental factors. Cooler temperatures, or more stressful conditions, lead to brown colors whereas warm temperatures and the lack of stress leads to the lizard’s being green. If I understand it correctly, this rapid color change is controlled by hormones released by the pituitary gland. When stressed, production of a hormone moves brown pigment granules to the surface, obscuring the blues and yellows beneath, and changing the overall color from green to brown.

    I attempted to gather this information from a variety of online resources, but invariably got bogged down in scientific nomenclature like the following sentence: In this species, dermal chromatophores are known to be free of sympathetic innervation, leaving body color subject only to the influence of circulating chromo-active hormones: epinephrine (EPI), norepinephrine (NE) and melanotropin (MSH). I’m sure that is meaningful if you study such things, but I was getting lost. Then, I discovered an amazingly comprehensive community blog entitled, Anole Annals, written and edited by scientists who study Anolis lizards. They did a good job of synthesizing information in a more palatable form. I am constantly amazed (and impressed) by the availability of information and by the dedication and passion of those responsible for researching it and posting it on the web. I did not know until reading this site that the Carolina Anole is the first reptile to have had its genome sequenced. It seems that this species is one of the most studied reptiles in the world in a wide range of disciplines including physiology, behavior, ecology, and other subjects. Many of the studies have implications for human health and behavior.. There is even a citizen scientist page on that site so you can contribute your personal anole observations.

    Carolina Anole in rain head shot with yellow leaves eyes closed
    My anole finally tires of the photo session

    No wonder my little anole started to doze off after several minutes of our photo session. She and her kind have been subjected to scientific research and public fascination for a very long time. She may need the rest. And, it seems like there is still a lot of research to be done.

    I’ve spent my entire professional career studying anoles and have discovered that the more I learn about anoles, the more I realize I don’t know.

    ~Jonathan Losos, Anole Annals

    By the way, if you didn’t do it as you read through, you really should go back and click on a few of the photos, especially the close ups of the head, in order to really appreciate the subtle colors. And check out that ear opening while you are at it.

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