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SE Nebraska | Scientists have known whales evolved from semiaquatic, four-footed creatures with long, thin tails to today's fully aquatic mammals with fluked tails, no back legs, and flippers instead of front legs.
(Related story: Whales Evolved From Tiny Deerlike Mammals, Study Says [December 19, 2007].)
http://news.nationalgeographic.com/news/2007/12/071219-whales-evolv...
At the bottom of this story it says:
Given this previous work, Indohyus could indeed be the ancestor of whales, he noted.
But "I do not believe the evidence presented here demonstrates that with confidence," he said in an email.
"It is an interesting hypothesis to be tested as more complete [Indohyus] fossils are discovered."
So they found some incomplete skeletons of this small creature, and made some assumptions and concluded that it turned into a whale.
The original story says
Amateurs found different parts of the newly described fossils over time in Coffeeville Landing, Alabama.
After the various fossil parts were brought to the University of Alabama in 2005, Uhen realized that all the pieces belonged to the same individual of the species Georgiacetus vogtlensis.
So they decided that the various pieces were actually the same creature. Even though nobody has ever seen this supposed creature.
Kind of like tossing a couple of jigsaw puzzles together, and deciding that since all of these pieces are blue and all of these pieces are green, that they go to the same puzzle. Even though, unknown to the assembler, both puzzles have grass and sky.
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