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The discovery suggests that after the first animals emerged from the ocean around 400 million years ago, they evolved the ability to live exclusively on land much faster than previously assumed.
How ancient reptile footprints are rewriting the history of when animals evolved to live on land Scientists in Australia have identified the oldest known fossil footprints of a reptile-like animal ...
Only animals that evolved to live solely on land ever developed claws. The earliest vertebrates -- fish and amphibians — never developed hard nails and remained dependent on watery environments ...