Photos by joelsartore | 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. The remarkable frogs reside along streams and rivers in the tropical forests of Ecuador, Colombia, and Panama. These photos were taken centrojambatu. To see more species featured in the Photo Ark, follow me, joelsartore. #PhotoArk