Close_up of glass frog larvae tadpoles developing in their eggs, seventeen days after being laid. Glass frogs are named for their translucent skin, through which internal organs can be seen. The heart of the tadpole at left is seen beating beneath the skin. Glass frogs family Centrolenidae inhabit moist tropical forests in Central and northern South America. They typically lay their eggs on a leaf above water, so that the tadpoles fall into the water as soon as they hatch. Filmed in the Ecuadorian Amazon.