BEHAVIOR OF HORNED GUANS IN CHIAPAS, MEXICO

Behavior of Horned Guam (Oreophasis derbianu~) in the El Triunfo Bio- sphere Reserve, Chiapas, Mexico, from February to May in 1982 and 1983, including preen- ing, dustbathing and foraging behavior during the breeding season, is described. Horned Guam devote most of their daytime activity to preening and comfort behavior. To dustbathe, they use treefall gaps and only bathe once a day. Dustbathing seems to be an important factor during courtship. Horned Guans are mainly arboreal and consume mostly fruits and green leaves. Received 13 April 1993, accepted I Sept. 1993. Most populations of the Horned Guan (Oreophasis derbianus) are im- periled as a result of intense hunting and rapid destruction of the cloud forest in the species' restricted geographical range in southern Mexico and Guatemala (Collar et al. 1992). Behavioral and ecological information