Paleontologists working in Patagonia have unearthed the oldest-known fossil of a tadpole—and it was a whopper, measuring in at more than six inches long, the size of an adult human hand. The specimen, ...

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.