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

Like human language, birdsong changes over time and space. Local song traditions change, as human language does. Largely for this reason, birdsong, like language, shows geographical variations or dialects.