Written and illustrated by David Allen Sibley, America's most widely respected bird illustrator and ornithologist, this FoldingGuide offers instant access to just what the beginning birdwatcher needs to know. All 18 species of North American owls are covered,including multiple illustrations, descriptive captions, size, range, and seasonal presence. In addition, the guide includesinformation on owl vocalizations, how they hunt, nesting behaviour, camouflage postures, and how owls use their unique head structure and ears to hear so effectively.