Glass Frogs Have Translucent Stomachs

Glass frogs are so named for the glass-like appearance of their undersides. The skin on their bellies is completely translucent, which means you can see their stomachs, hearts, and other organs. In fact, you can actually see a glass frog’s heart beating, its intestines and stomach digesting food.

Glass frogs are an amazing sight but seeing one raises an interesting question: what’s the point of having transparent skin if your predators can still see you, or your internal organs?

Let’s take a step back to see how transparency works and understand why we’re not constantly bumping into invisible creatures. Although transparency seems like an obvious type of camouflage — if that’s not too much of a contradiction in terms — becoming transparent is not easy.