Owls have a rich repertoire of sounds for communicating in the dark. A 56-page booklet with full-color images describes the wide variety of vocalizations made by each species. It will help birders identify these denizens of the night–from the ghostly Barn Owl, to the tiny Elf Owl, to the familiar Great Horned Owl. You'll gain a greater appreciation for owls and their sounds and behaviors.