1992. Donald S. Heintzelman. In this, the first full-scale owl-watching field guide ever published, birders will find expert advice and information on owl-watching equipment, owl pellets and food habits, migrations and invasions, survival adaptations, conservation and more. Contains detailed descriptions and information about 19 native species. There are also directions to a host of owl-watching sites in 40 states and Canada. 84 b&w photos. 193 pages, soft cover.