In this post, you’ll meet the invisible frog that may cause breakthroughs in medical research – as if its transparency wasn’t ...

Some creatures blend in by sticking out. Learn more about glass frogs and the special way they hide their blood.

The northern glass frog, which ranges from southern Mexico ... hiding nearly 90 percent of its red blood cells inside its opaque liver during its daytime slumber. But these furtive amphibians ...