The frog says, "Ribbit ribbit." Anyway, that's what I learned from my old See n' Say. Perhaps unsurprisingly, Fisher-Price was not holding that toy to the highest standards of scientific nuance. See, it turns out that frogs "talk" to one another in other ways, as well. In particular, they vibrate. Not vocal chords. But their whole bodies.

In this video interview with Michael Caldwell, frog researcher at the Smithsonian Institute for Tropical Research in Panama, environmental journalist Gaia Vince introduces the quieter side of frog communication, where amphibians can say a lot without saying a word.