Listening to the urban choir

Perhaps you were woken up today by the calls of a singing bird — perhaps trying to mate, or simply to communicate. In an Anthropocene world, those birdsongs are changing. Songbirds today, many of whom live in the midst of human cities, are singing into increasingly noisy skies. Their songs must compete with the din of planes, trains, and automobiles — and birds have been adapting their song to compensate.