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

Most frogs defend themselves with toxins that sit passively in their skin, but only two species are known to go a step further and actively inject venom into anything that grabs them. These little ...

The frogs belong to the Atelopus group from Central and South America.

Scientists have discovered a new species of poisonous frog—brightly colored and measuring just a few millimeters—in the Amazon, according to a Peruvian government agency in charge of environmental ...

This newly discovered poison frog may represent an evolutionary step on the pathway towards developing brilliant warning coloration associated with other poison dart frogs. A small reddish-brown frog ...

Add Yahoo as a preferred source to see more of our stories on Google. The Panamanian golden frog (Atelopus zeteki) has been extinct in the wild since 2009, thanks in part to a deadly skin disease. Now ...

Deep in the Panamanian jungle, conservation biologist Brian Gratwicke and his team hunted a radio transmitter signal that led them to a ferocious-looking whip scorpion in the middle of a meal. Some ...