A new study suggests the platypus and echidna — the only egg-laying mammals — had a water-dwelling ancestor. The finding could upend what’s known of their evolution.

Fossil tracks found in Australia push the origin of reptiles back by 40 million years, altering the timeline of tetrapod ...

Fossil suggests four-legged tetrapods transitioned from ocean to land 35 million years earlier than previously thought.

The footprints of a reptile-like creature appear to have been laid down around 356 million years ago, pushing back the ...

By combining data on all known bird species, this tree is the most impressive snapshot yet of one of Earth’s most ...

The emergence of four-legged animals known as tetrapods was a key step in the evolution of many species today – including ...

A research team has created a comprehensive evolutionary tree of all bird species, integrating data from hundreds of studies ...

Although almost certainly still encased in fleshy lobes, appendages could have helped support or even propel the animal in shallow water or mud flats. If so, it changes our view of the evolution ...

it is believed that dolphins and whales evolved from land animals and share lineage with hippos. But there are few examples that show evolution from water to land. The transition requires ...