recentpopularlog in

aries1988 : bird   19

Two young academics puzzled by the comments of reviewer no. 3.
gif  researcher  fun  bird 
december 2018 by aries1988
A Voyage to the End of the World
Amid the monochromes, the endless black and white and gray, was the jarring blue of glacial ice. No matter the shade of it—the bluish tinge of the growlers bobbing in our wake, the intensely deep blue of the arched and chambered floating ice castles, the Styrofoamish powder blue of calving glaciers—I couldn’t make my eyes believe that they were seeing a color from nature.

the sanatorium in “The Magic Mountain”:

Everybody loves penguins. In the erectness of their bearing, and in their readiness to drop down on their bellies, the flinging way they gesture with their armlike flippers, the shortness of the strides with which they walk or boldly scamper on their fleshy feet, they resemble human children more closely than does any other animal, not excepting the great apes.
antarctic  voyage  story  business  bird  penguin  ship  travel  ocean 
april 2018 by aries1988
Birds of Europe - identification, distribution, voices on the App Store
Read reviews, compare customer ratings, see screenshots and learn more about Birds of Europe - identification, distribution, voices. Download Birds of Europe - identification, distribution, voices and enjoy it on your iPhone, iPad and iPod touch.
bird  app  iphone  deutsch  buy 
october 2017 by aries1988
Le coucou, imitateur perfide
ZOOLOGIE. Après avoir pondu dans le nid de la rousserolle, la femelle coucou pousse un cri, semblable à celui de l’épervier. Une technique imparable pour perturber la vigilance de son hôte.
september 2017 by aries1988
Interview with Ornithologist Richard Prum: What Duck Sex Reveals about Human Nature - SPIEGEL ONLINE - International

Prum: To understand this, you have to consider the evolutionary mechanisms involved: If the female gets the mate she likes, then her offspring will inherit the green head and the quack-quack-quack, all those displays that she likes so much. And since all other females have coevolved to prefer those same traits, her sons will be very successful and she will have lots of grandchildren from him. But if she's fertilized by force, then some random male will father her kids, which means that her offspring are less likely to inherit the attractive traits that she and other females like. That means fewer grandkids. Therefore, evolution will favor any mutation that allows her to get her own choice -- for example by protecting her vagina against forced sex.

Unlike ducks, 97 percent of birds cannot be forcibly fertilized, because the males don't have a penis. Copulation in most birds is achieved by a cloacal kiss, just an apposition (or touching) of orifices. So, to be fertilized, the female has to actively take up the sperm, which means that she retains full control of her sexual choice. By the way, I think this is the essential reason why birds are so beautiful. Since they have the freedom of choice, females exhibit aesthetic preferences. And, as a result of these preferences, males developed amazingly elaborate ornaments.

SPIEGEL: You are suggesting that women were attracted to small teeth?

Prum: Yeah, and I even think that this is where our smile comes from. It is a sexual symbol advertising one's state of de-weaponization.

SPIEGEL: And females made them give up this bad habit by choosing more good-natured males?

Prum: Yes. Solving the infanticide problem was the biggest hurdle in human evolution. Infanticide is the single largest source of infant mortality in gorillas and chimpanzees. Approximately 30 percent of all infant deaths are the result of infanticide by males. On the other hand, everything that is special about human biology requires greater investment in longer childhoods -- whether it's complex cognition, language, culture or technology. None of that could possibly have evolved if a large portion of babies are being murdered by sexual violence.
bird  sex  human  animal  evolution  interview  opinion  research  duck  penis 
july 2017 by aries1988
Hunting Pigeon in the Pyrenees — for Supper
FALL IS WILD GAME SEASON in France, and discerning diners at Parisian outposts like L’Ami Jean , La Régalade and Spring come especially for the composed dishes…
story  basque  hunting  bird 
november 2016 by aries1988
Dutch Firm Trains Eagles to Take Down High-Tech Prey: Drones
When small, off-the-shelf models pose security or other threats, birds have the advantage of grounding them without a potentially dangerous crash.
animal  bird  drone  solution  airplane  airport  safety 
may 2016 by aries1988
Obscure truths
Air pollution seems to speed birds up, not slow them down
discovery  pollution  bird 
january 2016 by aries1988
V0088: Turning on a Dime – Asymmetric Vortex Formation in Hummingbird Maneuvering
Hummingbirds are versatile natural flyers that can perform locomotion as insects, such as hovering, forward/backward flight, turning maneuver and more. The unsteady vortex dynamics is key to understand aerodynamic features of these motions. Here we present an integrated approach combining high-speed photogrammetry, wing/body surface tracking, and immersed boundary method based flow simulations to study the three-dimensional vortex dynamics of a freely maneuvering hummingbird. The simulation results of the hummingbird performing pure yaw turn show asymmetric wake structures between the inner and outer wings. Dual-loop vortex structures have been observed in the near wake of the outer wing during downstroke, and of the inner wing during upstroke. The interactions between the wings and these complex vortex structures have implied both aerodynamic and dynamic benefits of the flapping wings in hummingbird’s maneuvering flight. (This work is supported by NSF CBET-1313217 and AFOSR FA9550-12-1-0071)
bird  cfd  fluid  visualization 
january 2016 by aries1988

Copy this bookmark:

to read