The northern glass frog, which ranges from southern Mexico to Ecuador, even conceals its blood to render its body more translucent, hiding nearly 90 percent of its red blood cells inside its ...

This photo provided by researchers in December 2022 shows a glass frog, strict leaf dwelling frogs, that sleep, forage, fight, mate, and provide (male) parental care on leaves over tropical streams.

When glass frogs emerge during the rainy season, researchers at the Smithsonian Tropical Research Institute follow their migration out of the forest and along streams. These transparent leaf-lying ...

Glass frogs also have a unique circulatory system, with veins that are closer to the surface of the skin. This allows the oxygen-rich blood to be visible through the skin ...

Epipedobates are species of poisonous frogs found in dry and humid tropical forests on the western side of the Andes in ...

But when northern glass frogs wake up and hop around in search of insects and mates, they take on an opaque reddish-brown color. “When they’re transparent, it’s for their safety,” said ...