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

A siphonophore—a colonial marine invertebrate related to the venomous stinging Portuguese Man-o-war—is scanned using Deep ...

All you ever needed to know about poison dart frogs, from why they're poisonous to where they live and what they eat ...

Of the roughly 18,000 new species discovered each year, a few have a certain star quality. In 2008, when an orange-haired, ...

True blue is one of nature's rarest tricks, and the animals that pull it off range from tiny ocean drifters that steal venom ...

Forests are home to some of the most strange and beautiful animals on Earth. Some feature elaborate branch-like antlers, while others have hauntingly glowing eyes, massive ears, or intricately ...

Some frogs have evolved features so strange that scientists struggle to explain them, and a few look less like amphibians ...

The tomato frog looks most like its namesake when threatened with attack from a predator, at which point it puffs up, making ...

Behind a newly purchased house, rescuers discovered an abandoned pet store that had been left with animals still trapped ...

For a frog no bigger than a fingernail, survival depends on how it spends every bit of energy. New research from the University of Florida shows that young frogs prioritize growing quickly even when ...