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 ...

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 ...

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 ...

The birth of 33 frogs at the London Zoo has been hailed as a “landmark moment” in the ongoing battle to save an endangered species that was first described by Charles Darwin during his epic voyage on ...

Epipedobates are species of poisonous frogs found in dry and humid tropical forests on the western side of the Andes in Colombia, Ecuador and northern Peru, according to a study published Feb. 6 in ...

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.