Four-legged animals first developed the ability to breathe air as ancient fish in water, scientists have found.
Land animals developed legs millions of years before their feeding systems changed enough to let them eat a strictly land-based diet, US paleontologists say.
The world`s first 3D reconstruction of a four-legged animal backbone has shown that the early animals on land moved around like seals.
Day in Pics: 23rd September
Showbiz World - September 23, 2014
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