Long-limbed and sporting dramatic horns above its eyes, Guenther’s marsupial frog is a bizarre-looking amphibian from the misty cloud forests of the Andean slopes. Like other marsupial frogs this ...

A fragment of upper jaw fossil from the Early Cretaceous is among the oldest examples of a toothless amphibian in the fossil record Chihiro Kai The arid valleys of Wyoming’s Cloverly Formation are ...

Amphibians are cold-blooded animals that can live both in the water and on land. When we think of amphibians, frogs and toads instantly jump to mind. Usually, we think of frogs as being quite small.

In a new study, biologists laid to rest a century-old debate by confirming that a single species of frog, out of the more than 7,000 living today, has true teeth on its lower jaw. In a new study, ...

In general, frogs’ teeth aren’t anything to write home about—they look like pointy little pinpricks lining the upper jaw. But one group of stream-dwelling frogs in Southeast Asia has a strange ...