Clarice is a striking eastern gray treefrog from South Carolina ... healthy offspring with another species, the barking tree frog, he and Clarice couldn't possibly be successful.

Red-eyed tree frogs, despite their conspicuous coloration, are not venomous. They are found in tropical lowlands from southern Mexico, throughout Central America, and in northern South America.

This story appears in the March 2017 issue of National Geographic magazine. These frogs put the “group” in “group sex”—and that helps them thrive. Of all vertebrates, gray foam-nest tree ...