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 ...

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 ...

In field studies, a US expert studied the glass frog (Sachatamia orejuela), which is found on slippery rocky surfaces near the water. Video footage reveals a male specimen showing off with a ...