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Dolphins  from twitter
yesterday by camflan
Wild Dolphins Learned to 'Tail-Walk' From Captive Ones - The Atlantic
That became clear after she was released back to Port River. She tail-walked around Bossley’s boat. She tail-walked in the bow of ships—the only dolphin ever known to do so. Then, in 2007, Bossley and his team of volunteer observers saw another female, called Wave, perform the trick. Her proficiency grew as Billie’s health started to falter. And after Billie died of kidney failure in 2009, “Wave’s tail-walking exploded, and she started doing it all the time,” says Luke Rendell from the University of St. Andrews. “The sheer number of times she did it was probably the influence that got other dolphins to do it, too.”
dolphins 
september 2018 by yorksranter
Whale Fossils Reveal Bizarre Evolution, Amazing Adaptations
"Pakicetus fits into the bestiary of these early whales that are experimenting with various ecological modes. It may have looked more like a dog or a wolf—others looked more like otters or sea lions—but all these variations ended extinct. Those branches begat nothing, but there was one that did beget the whales we have today, and those were the ones that went fully aquatic, divorcing themselves from the land. That one branch then radiated into the 80-odd species of cetaceans we see today. Not just the big ones. Dolphins and porpoises all descend from that ancestral whale that went back to the water full time."
whales  animals  multispecies  evolution  dolphins  porpoises  via:lukeneff  foreden 
august 2018 by robertogreco
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Travel  Dolphins  Beach  Happy  Vacation  from twitter_favs
august 2018 by shaneisley
Tapetum lucidum - Wikipedia
"The tapetum lucidum /təˈpiːtəm/ (Latin: "bright tapestry; coverlet", plural tapeta lucida)[1] is a layer of tissue in the eye of many vertebrates. Lying immediately behind the retina, it is a retroreflector. It reflects visible light back through the retina, increasing the light available to the photoreceptors (although slightly blurring the image). The tapetum lucidum contributes to the superior night vision of some animals. Many of these animals are nocturnal, especially carnivores, while others are deep sea animals.
"Similar adaptations occur in some species of spiders.[2] Most primates, including humans, lack a tapetum lucidum, and compensate for this by perceptive recognition methods."
night  vision  nocturnal  carnivore  cats  spiders  dolphins  orcas  eyeshine  photos  iridescent  retroreflector 
july 2018 by andreasbuzzing

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