An Active Bald Eagle Nest Associated with Unusually Close Human Activity

Abstract

Department of Psychology and Regional Primate Research Center, University of Washington, Box 351525, Seattle, Washington 98195 USA. Submitted 14 September 1998, accepted 15 April 1999. Corresponding Editor: K. A. Engel. prised 2.5% of items at 17 nests on Vancouver Island (Vermeer and Morgan 1989. Northwestern Naturalist 70:21-26), and 3 crows were found in 102 nests in Puget Sound (Knight and others 1990. Canadian Field Naturalist 104: 545-551). Although scavenging cannotbe ruled out as the source of nest remains, the observations reported here suggest that at least some were due to predation. The present observations document the real predation threat of bald eagles on crows. This threat justifies the study of predator vigilance and response in crows when bald eagles are present. Predation of crows by bald eagles requires heightened vigilance in crows, thereby