Seven a.m., when Fio takes Sonya Dog into the backyard every morning, is a very noisy time out in the boondocks. The air is full of high-pitched chirps, tweets, pipings, rattles, coos. and crows, an orchestra of soprano instruments.
Lower the pitch a couple of octaves and Fiorella would be hearing dinosaurs. The din must have been deafening. Fio wonders--has the planet ever been silent? Maybe Earth's vocalizations are what distinguish us from the rest of the universe.