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

It’s not easy being green, as a famous frog once sang — and in recent decades, just surviving has become even harder for frogs and other amphibians. They are experiencing a 3.79 percent average annual ...

There are over 5,000 species of frogs worldwide—more than 100 in North America alone. Frogs show a tremendous amount of biodiversity in their calls, their coloration, their body type, and their ...