Close_up of the larva tadpole of a glass frog in its egg, 14 days after it was laid. Glass frogs are named for their translucent skin, through which internal organs can be seen. This developing tadpole磗 beating heart is seen at centre, with its jaws to the right. Glass frogs inhabit moist tropical forests in Central and northern South America. They lay their eggs on leaves overhanging water, into which the newly_hatched tadpoles fall. Filmed in the Ecuadorian Amazon.