DURING THE BREEDING SEASON IN SOUTHERN CHILE

Argentina from 36°S in the north to the Strait of Magellan in the south. It inhabits dense, scattered and scrubby Nothofagus forests in rugged terrain and shrub-steppe flatlands (Bierregaard 1995). Although B. ventralis is considered rare (Clark 1986, Bierregaard 1998), its numbers appear to be increasing, perhaps due to the fragmentation of native forests as a result of human activities (Jaksic & Jiménez 1986). However, logging pressures on the remaining primary and secondary for-ests of southern Chile (Fuentes 1994) affect mainly the older trees that the Rufous-tailed Hawk uses for placing its nest, perching, mat-ing, and hunting (Housse 1945, Goodall et al