Glass frog photographed during sleep and while active, showing the differences in red blood cells within the circulatory system. Jesse Delia via AMNH When a tiny glass frog dozes off to sleep, its ...

What if you had the power of invisibility, but it only works when you’re asleep? That might be useful for a surreptitious nap in public, but it still probably wouldn’t suit you as well as it does the ...

A species of Ecuadorian glass frog combines high-frequency croaking and a striking visual display to attract mates, in what is a fascinating adaptation to a noisy environment. Frogs typically use ...

Camouflage takes many forms in the natural world. Some animals are born with skin or coats that blend in naturally with their environment. Some Old World lizards like the chameleon have an almost ...

These tiny Latin American tree dwellers are stellar fathers and masters at camouflage, recent research reveals. The eggs of a female sun glass frog (Hyalinobatrachium aureoguttatum) are visible ...

The glass frog's translucent stomach skin offers a window into its internal organs. New research finds this odd seeming trait may help the frogs evade predators. Jorge GarcÍa / VW Pics / Universal ...