Birdology: Adventures with a Pack of Hens, a Peck of Pigeons, Cantankerous Crows, Fierce Falcons, Hip Hop Parrots, Baby Hummingbirds, and One Murderously Big Living Dinosaur

by Sy Montgomery

They usually circle as a group and start out flying as one big flock, even though many of the pigeons have never met before; they know there is safety in numbers.