My wife and I hear frogs outside every night, and every few minutes or so, they'll all stop croaking for reasons I have yet to identify. Last night I kept listening for a noise, time-interval, anything that would trigger their silence; I couldn't identify a pattern. The only pattern I noticed is that they all stop at once. I never heard a rogue frog croaking on its own after the halt of a croaking session, however, I did notice that a single frog only needed to croak 2-3 times before the whole group started-up again. Does anyone know why they all stop at once, and why I never hear any of them croaking alone? Is there an "alpha frog" who decides when the croaking stops?