The red-eyed tree frog is harmless, but its colors make it look dangerous. Found in the rainforests of Costa Rica.

Pennsylvania has this sneaky habit of hiding natural treasures in plain sight, like it’s playing a game of “guess where I stashed paradise this time” with its residents. Codorus State Park might be ...

Wood frogs — Lithobates sylvaticus, also known as Rana sylvatica — live farther north than any other amphibian, even beyond ...

Researchers discovered that a poison frog species described decades ago was based on a mix-up involving the wrong museum ...

Red blood is the exception, not the rule. Evolution has painted it green, purple and white in animals that push physiology ...

Nearly 20 years ago, the last known Cascades frog disappeared from Lassen Volcanic National Park. Now researchers are ...