How Glass Frogs Weave the World’s Best Invisibility Cloak
Glass frogs do not live a life of modesty. With their semitransparent skin—green on the back, clear on the belly—the tree-dwelling, gummy-bear-size amphibians, which are native to the tropics of Central and South America, have little choice but to put their organs on display. Gaze up at certain species from below, and you’ll be treated to an aquarium of innards: a beating heart, a matrix of bones, the shimmering silhouette of the gut.