Fully Transparent Rain Forest Frog

The glass frog’s stomach is completely transparent. Close examination reveals a fully visible system of organs, including the heart, liver, and full intestinal tract. Scientists believe that earlier frogs of this species evolved to have this trait for camouflage; while perched on a leaf or branch, they are extremely difficult to spot from a distance. Different species can be found in Central and South American rain forests, usually in the canopy, far above the ground.