The poison dart frog may be tiny, but it's one of the most dangerous animals on Earth. Some species, including the golden ...

Some harlequin frogs have lost their poison—and their ability to defend themselves. Scientists are on the case.

Deep in the tropical forests of Colombia, you come across a small, beautiful frog. You’re captivated by its brilliant color and reach out to hold it in your hand. Within seconds, your hand starts to ...