DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Glass frog, underside. The background colouration of most glass frogs (family Centrolenidae) is primarily green, but the abdominal skin of some members of this family is transparent. The internal organs, including the heart, liver, and gastrointestinal tract are visible through this translucent skin. Photographed in Costa Rica.
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