Glass frog

Family of amphibians

The glass frogs belong to the amphibian family Centrolenidae (order Anura), native to the Central American and Colombian rainforests. The general background coloration of most glass frogs is primarily lime green, the abdominal skin of some members of this family is transparent and translucent, giving the glass frog its common name. The internal viscera, including the heart, liver, and gastrointestinal tract, are visible through the skin.

From Wikipedia, under CC BY-SA. More on occurri.