A new study suggests the platypus and echidna — the only egg-laying mammals — had a water-dwelling ancestor. The finding ...

The love songs of these Panamanian frogs is a dinner bell for fringe-lipped bats. But how do they learn which frogs and toads ...

Knife-toothed reptiles called sebecids went extinct on the mainland 10 million years ago. New fossil evidence puts them on an island 4 million years ago.

After the demise of the dinosaurs following an asteroid strike 66 million years ago, mammals became Earth's dominant land ...

It took nearly 100 years for a duo of endangered Philadelphia Zoo tortoises to become parents and the "Golden" moment is now ...

A controversial idea suggests the ancestors of echidnas were more like the platypus. For the first time, fossil evidence ...

Four baby Galapagos tortoises made their public debut Wednesday at the Philadelphia Zoo. They are the offspring of the zoo’s ...

Lake sturgeon spawning has been observed in Missouri for the fourth consecutive year, indicating successful wild reproduction ...