There are around 151 species in this family of tree frogs. They are called glass frogs because they have transparent skin, and you can see their internal organs, bones, and muscles through their skin.

Glass frogs are usually green with red, blue, yellow, or white markings. Most species are around an inch in length. They are found in mountain rainforests in South and Central America and live in trees near streams, creeks, and rivers.

The female lays her eggs on the leaves of a tree overhanging the water. Both parents guard the eggs from predators. When the eggs hatch, the tadpoles fall into the water.