?Walking? fish may help scientists understand how ancient animals learned to move on land
Web edition : Thursday, January 5th, 2012
You may not be familiar with the word tetrapod, but you know one when you see it. All tetrapods are vertebrates ? animals with backbones ? and most move on land. They also have four limbs ? or their ancestors did, as in the case of snakes and whales, for example. Reptiles, birds and amphibians all count as tetrapods, as do mammals. You?re a tetrapod.
By studying fossils, scientists know that tetrapods haven?t always roamed Earth. Now, biologists have found evidence that animals were preparing to walk while still living underwater.
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Found in: Biology and Science News For Kids
Source: http://www.sciencenews.org/view/generic/id/337381/title/FOR_KIDS_Fins_as_early_legs__
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