Abstract
Twenty-one species of birds were identified as predators of the Douglas-fir tussock moth ( Orgyia pseudotsugata ) near Fort Klamath in southwestern Oregon. Nine species were seen eating larvae or pupae; 12 species were observed foraging on branches from which larvae or pupae disappeared. Dark-eyed junco, red-breasted nuthatch, and mountain chickadee were the dominant predators. Loss rates of tussock moth prey were closely associated with concurrent densities of avian predators.
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