The transparent skin of the sun glass frog gives us an impressive view of the inner workings of this amphibian, with its internal organs, bones, and muscles on full display. These remarkable frogs reside along streams and rivers in the tropical forests of Ecuador, Colombia, and Panama. Video taken at Arca Sapos. Centro Jambatu . The National Geographic Society is proud to support Explorer Joel Sartore in his quest to photograph the world's species for the National Geographic Photo Ark. #glass #f