Early ancestors of the ocean's biggest animals once walked on land. Follow their extraordinary journey from shore to sea. Although whales are expert swimmers and perfectly adapted to life underwater, ...

A dog swimming laps is another example of an instinctual response. When a dog is suddenly lifted from the water, its legs ...

Ichthyostega clearly spent some time out of water. From these finds, it now appears that the four legs common to land animals today really evolved for another purpose: navigating swampy wetlands ...

The chick was born with four legs instead of tow ... This is not the only rare animal in the news as of late. A precious Spaniel by the name of Ariel who was born with six legs is living her ...