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LIFE WITH NEW BEGINNINGS......A single breath from a playing child can send dozens of fluffy dandelion seeds floating into the air. Now scientists find these seeds can keep themselves aloft by generating a type of vortex previously thought too unstable to exist, helping explain how these flowers have dispersed across the planet.
Each dandelion seed is attached to a bundle of roughly 100 feathery bristles known as a pappus, whose name derives from an ancient Greek word for grandfather due to its resemblance to a beard. This structure prolongs the descent of seeds by dragging on the air a bit like a parachute, ensuring that horizontal winds can help carry the seeds farther. Most dandelion seeds probably land within 2 meters of their parent flowers, but in warm, dry, windy conditions, some may fly more than a kilometer.
Dandelions are far from the only plants to use wind to help disperse their seeds. It was a puzzle as to why dandelions evolved plumes to help keep their seeds in the air, rather than winglike membranes, such as what maple seeds have.
To explore this question further, scientists at the University of Edinburgh in Scotland built a vertical wind tunnel to investigate the physics of dandelion seed flight. They blew air under dandelion seeds that were either freely flying or fixed in place, adding smoke into this wind and illuminating it with a green laser to help reveal the way air moved around the seeds.
Using long-exposure photography and high-speed imaging, the researchers discovered that a kind of stable air bubble known as a vortex ring remained a fixed distance from the seeds. Experiments with silicon disks of varying porosity that imitated the aerodynamics of a dandelion pappus suggested the circular geometry and airy nature of the pappus is tuned precisely to stabilize these vortex rings, helping them deliver four times more drag than a solid disk with the same area. As such, this plumed structure may prove ideal for the dispersal of the small, light seeds of short plants, whereas winglike membranes likely prove better for larger seeds, the researchers write.
Prior work had found that objects could form vortex wings in their wake, but these either stayed anchored to these items or flew downstream. This newfound type of vortex ring was previously thought too unstable to actually occur, and suggests examining nature could reveal other as yet unknown kinds of fluid behavior.
This picture represents and interesting event in this chick’s life history. Up to this point, at least during the time I was lucky enough to be watching, the most Junior would do was peck at his food. He relied upon Mom to tear up the prey and feed it to him. They demonstrated a very close bond, lots of Mom preening her pride and joy and sometimes Junior preening Mom. This shot was taken close to sunset. Mom took the foot shown in her beak, a body part Junior in the past seemed to relish, and flew to a nearby branch. From there she made a call I hadn’t heard before. It was explained to me by Karen, a woman also watching, that Mom was attempting to entice Junior to make the short flight from the nest branch to where she was perched with the tasty tidbit. I hadn’t seen the chick attempt to fly but his feathers had grown in a lot and it would not have surprised me to see a short flight. Unfortunately, I can’t get back to the nest until after Junior will have fled the coup but hope he or she has a bright future and will not move too far from the neighborhood. (Bubo virginianus). (Sony a1ii, 400mm lens, f/3.2, 1/2000 second, ISO 3200).
Killdeer (Charadrius vociferus)
Rogue Valley - Jackson County - Oregon - USA
Habitat : Grasslands
Food : Insects
Nesting : Ground
Behavior : Ground Forager
Conservation : Low Concern
"A shorebird you can see without going to the beach, Killdeer are graceful plovers common to lawns, golf courses, athletic fields, and parking lots. These tawny birds run across the ground in spurts, stopping with a jolt every so often to check their progress, or to see if they’ve startled up any insect prey. Their voice, a far-carrying, excited kill-deer, is a common sound even after dark, often given in flight as the bird circles overhead on slender wings... The Killdeer’s broken-wing act leads predators away from a nest, but doesn’t keep cows or horses from stepping on eggs. To guard against large hoofed animals, the Killdeer uses a quite different display, fluffing itself up, displaying its tail over its head, and running at the beast to attempt to make it change its path."
- Cornell University Lab of Ornithology
The often-observed "heart" pattern, which occurs when two swans turn their necks toward each other, is, from an ethological perspective, part of ritualized courtship and bonding behaviors. Such synchronized movements strengthen the pair bond through repeated positive social interaction and simultaneously serve to communicate stability to other swans.
I have also observed on another occasion how a third swan attempted to disrupt this courtship display.
Information & Credits are on the blog post - rissasecondlife.blogspot.com/2019/03/unnatural-behavior.html
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The juvenile had been closely following the adult and they move so fast that I don't really know what happened next. And then this. I look at it as chiding, but it could be encouragement, or, of course, anything much less anthropomorphic.
RKO_6604. Maybe not the best action shot but it was fun to watch them and a real challenge to get some acceptable shots. A little (too) far away shot, hence cropped to the max.
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Habitat : Forest
Food : Seeds
Nesting : Ground
Behavior : Ground Forager
Conservation : Low Concern
"Dark-eyed Juncos are neat, even flashy little sparrows that flit about forest floors of the western mountains and Canada, then flood the rest of North America for winter. They’re easy to recognize by their crisp (though extremely variable) markings and the bright white tail feathers they habitually flash in flight. One of the most abundant forest birds of North America... Juncos are the "snowbirds" of the middle latitudes. Over most of the eastern United States, they appear as winter sets in, and then retreat northward each spring. Other juncos are year-round residents, retreating into woodlands during the breeding season, or, like those of the Appalachian Mountains, moving to higher elevations during the warmer months."
- Cornell University Lab of Ornithology
RKO_5751. Love is in the air!
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One of the harder birds to capture is the female California Quail, well at least by comparison with the male who will take up his post (literally) to watch over his haren and kids. But, when it isn't mating season, then these little devils can run as fast as a roadrunner. Well, at the very least they could run faster than I can/could.
In my third year, I finally understood quail behavior enough to be able to get images like this: atop any fence post in the meadows during breeding season. The California quail (Callipepla californica), also known as the California valley quail or valley quail, is a small ground-dwelling bird in the New World quail family. These birds have a curving crest or plume, made of six feathers, that droops forward: black in males and brown in females; the flanks are brown with white streaks. But what I really love is that cross-hatched brood pouch which is more of an indentation than a pouch.
This was taken not far from the Bob Weiscarver Quail Restoration Project on Mt. Diablo. That was started in 2004, and by 2015 there were sufficient coveys so that maintenance rather than restoration would have been the appropriate term.
RKO_0658.
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The Great Horned Owl – large, powerful, and long-lived – is adapted by its anatomy, physiology, and behavior to survive in any climate but arctic-alpine regions. Equally at home in desert, grassland, suburban, and forest habitats, north to the tree line, it has a diverse prey base and the most extensive range with the most variation in nesting sites of any American owl. Its large eyes are equipped with many rods for night vision and pupils that open widely in the dark. Although its eyes do not move, flexibility in the atlanto-occipital joint enables this owl to swivel its head more than 180° and to look in any direction. Its hearing is acute, assisted by facial disc feathers that direct sound waves to its ears. Wild - at Pantanal - Brasil.
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I was very thrilled that this photo took first place in the NJ State Fair in the Animals-Color Division. It's a shot that holds special meaning to me since this is the very first family of bluebirds that nested on our property, in spring of 2016. In the photo, the male is feeding two of the five fledglings.
A blue-billed white tern, or manu o Kū, tends to his one-week-old downy hatchling clutching to the branch of a monkeypod tree. The manu-o-Kū is an arboreal nesting pelagic seabird that doesn’t actually fabricate a nest; instead, it uses a flat or hollow or fork in the tree to keep the single egg from rolling away. The hatchling uses its strong, clawed, semipalmate feet to cling to the tree branch on which it will balance until fledging. Parents alternate brooding duties until a week or two after hatching when the chick can thermoregulate and be left unattended for up to several hours. Adults fish up to 120 miles offshore and return with fresh provisions rather than consuming then regurgitating a meal for their chick. This avian behavior was known to Polynesian voyagers and other seafarers. A landmass that may be out of view over the horizon could be located by observing and following these birds conveying their catch back to their nestling.
I mentioned once before how amazing it is to see something in nature that you didn't set out to see. Well, this was one of those stories. Out looking for other wildlife, out of nowhere comes along this lone wolf. It was just so beautiful as it smelled it's way along the tundra. Though I have seen wolf previous to this encounter, I was never on the ground with them at eye level, especially with so few people around. I felt strangely comfortable with its presence. It was a day that left me with tears in my eyes, a great sense of gratitude, and of course, a great big smile. A day that I'll never forget. That's what makes being out in nature so amazing ... it's more that just about us ... so much more.
© Debbie Tubridy Photography
Himantopus mexicanus,
In ephemeral ponds after all the winter, early spring rains,
Carrizo Plain,
San Luis Obispo Co., California
This stilt waved its outstretched wings up and down, folded them, then repeated the waving several times. There were a pair of American Avocets nearby and eventually one of them chased the stilt briefly, then the avocets flew off a short ways. Since the displaying quit at that point, we assumed it was a display directed at the avocets. Stilts are known to have distraction displays near nests, so there may be a nest nearby. Or the hormones are such that it's that season and a display might be needed sometime soon.
He sits steady, shoulders square, expression unmoved. The monkey bends into its practiced pose, robe falling exactly where it should. One body trained to perform. The other trained not to react.
Control isn’t always force.
Sometimes it’s repetition—
until even the absurd feels orderly.
The Atlantic spotted dolphin (Stenella frontalis) is a dolphin found in warm temperate and tropical waters of the Atlantic Ocean. Older members of the species have a very distinctive spotted coloration all over their bodies.
The coloring of the Atlantic spotted dolphin varies enormously as it grows, and is usually classified into age-dependent phases known as two-tone, speckled, mottled, and fused. Calves are a fairly uniform gray-white, with one or no spots.
When they are weaned, speckling occurs, typically between 3 and 4 years and lasting for an average of 5 years. A juvenile is considered mottled when it develops merging gray and white spots on the dorsal surface and black spots on the ventral surface. This usually happens between age 8 or 9.
A fused pattern is reached when dark and white spots are on both the ventral and dorsal sides. As the animal matures, the spots become denser and spread until the body appears black with white spots at full maturation.
In comparison to other dolphin species, the Atlantic spotted dolphin is medium-sized. Newborn calves are about 35–43 in (89–109 cm) long, while adults can reach a length of 2.26 m (7 ft 5 in) and a weight of 140 kg (310 lb) in males, and 2.29 m (7 ft 6 in) and 130 kg (290 lb) in females.
Compared to the much smaller pantropical spotted dolphin, the Atlantic spotted dolphin is more robust. It shares its habitat with the pantropical spotted dolphin and the bottlenose dolphin.
The species exhibits a range of about ten different vocalizations, including whistles, buzzes, squawks and barks, each corresponding with different behaviors.
This image was taken in the North Atlantic Ocean, south of the Canary Islands
Brown Anole, Anolis sagrei, Caribbean native accidentally introduced to the US and elsewhere by the importation of ornamental plants. The pattern darkens in response to surroundings, for camouflage. Capable of high population densities, crowds out and preys on other lizards. Gulf Coast native Greens have been mostly relegated to treetops. Supposedly more wary of humans than Greens, but I took this through the kitchen window.
This Mew Gull in breeding plumage (the red eye ring) gives its feathers some careful attention.
Taken 5 June 2021 at Potter Marsh, Alaska.
Sunrise ~ Eiffel Tower ~ Paris ~ France ~ Saturday February 27th 2016.
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A Red-bellied Woodpecker casts an eye around to see who may have watched him stash a large acorn. Can you find it?
Buck Brannaman says "The horse is a mirror to your soul."
This is not my horse.
I won't elaborate. But, I will say this:
It's not his fault...
I've never seen anything so amazing as this little Grebe ( 12-inches and 1-pound } tackle anything this big. I never pass them up and think there behavior is very interesting so I always photograph them. He went under water for what seemed a long time and came up with this fish, I think by the look on it's face and looking at what he caught he had a problem. His mouth was so outstretched as you can see and still had no room for consumption. He did finally let it go but after quite some time, just an amazing little guy with an "A" for effort. Thank you all so much and hope that you find this as interesting as I did.
the pigeon guillemots sit on the rocks for ages before taking their catch to the juveniles in the nest, I have no idea as to why they do this..
Another photo of the courting behavior of these Red-necked Grebes. What a treat it was to watch them interact with each other. Taken at a pond in Calgary, Alberta.
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I think Al and Callie are a good example of behavior of "The People," as we call our animal family here. SO sweet to have them on the couch with us, and for the most part, they all come and go and get along so well! Callie is one of our most skittish scaredy cats, but she tolerates young Al quite a bit, as you can see!
Happy Caturday!
RKO_5610. Sitting on my deck these grebes came by and started their courtship dance. How lucky can you be!
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