How Animals Went From Fins To Legs To Fins Again

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Riddick
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How Animals Went From Fins To Legs To Fins Again

Post by Riddick » 04-21-2015 11:49 PM

Marine tetrapods, a group of animals that includes whales, dolphins, seals, and sea turtles, have moved from the sea to the land and back to the sea over the last 350 million years—each time making radical changes to their lifestyle, body shape, physiology, and sensory systems.

“These land-to-sea transitions act like repeated evolutionary experiments,” says Neil Kelley, a former lecturer in earth and environmental sciences at Vanderbilt University who is now a postdoctoral researcher at the Smithsonian National Museum of Natural History’s department of paleobiology.

“We can learn quite a bit about evolution by comparing the similarities and differences in each group.”

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Post by Doka » 04-22-2015 12:44 AM

How do they know this? They still can't find the plane lost last year.......Now, 350 million years ago........No problem :rolleyes:
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Post by Waverider » 04-22-2015 09:50 PM

Different department, Doka...
Now with all the radiation in the Pacific..
Wings would be advised.

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Post by Malaria_Kidd II » 01-10-2016 12:39 AM

Doka wrote:How do they know this? They still can't find the plane lost last year.......Now, 350 million years ago........No problem :rolleyes:
You posted in the right topic Doka!

I am a skeptic myself......... :roll:

:? “Snakes are one example that comes to mind,” Kelley says. “There is evidence that they went through an early marine phase, when they still had legs. Since then different groups of snakes have repeatedly gone back into the ocean. So it may be that snakes are particularly prone to habitat switching.”

:lol: "when they still had legs." What did they smoke just before writing this! :oops:

Another possible example is the elephant, which scientists know is closely related to manatees and sea cows. “Some evidence suggests that early elephants were highly aquatic—but whether they ever ventured into the ocean or stuck to freshwater is unknown.”

Considering the obvious, there are a few similarities between manatees and elephants. But living full time in the H2O aint it. Elephants are STILL highly aquatic when there's plenty of water. When living near oceans surrounding their African habitat they take deep dips. But that's about it over the last 350 million years.
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