Abstract
We recorded 621 prey items by direct observation, food remains and pellets collected from 11 Crested Goshawk (Accipiter trivergatus) nests in a Northern Taiwan mosaic forest landscape from 1995-2002. Mammals and birds contributed 61.7% of prey items and 96.8% of prey biomass. Although birds were the most common prey items (42.5%), they contributed less in prey biomass composition (45.4%) than mammals (51.4%). The prey items with high frequencies included rordents and Callosciurus erythraeus among mammals, Megalaima oorti, Passer montanus, Otus lettia and Myiophoneus insularis among birds, Japalura polygonata, and Sphenomorphus indicus among reptiles, and Cryptotympanp holsti among insects. Contrary to the sympatric Besra Sparrowhawk (Accipiter virgatus), Crested Goshawk had higher prey diversity and appeared to preyed on species heavier in weight. Prey spatial distribution, availability and their mobility also differ between these two congeneric species.
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