Breeding
Adults return to their nesting territories by March or April and begin laying eggs in April or May. Territories often encompass a variety of habitats, however the immediate nest area is often found in a mature or old-growth forest. The clutch size is usually 2 to 4, but anywhere from 1 to 5 eggs may be laid. The female is the primary incubator, although the male will sometimes take a shift to give the female a chance to eat. The male does most of the hunting for both the female and the young at the nest. The eggs average 59 mm × 45 mm (2.3 in × 1.8 in) and weigh about 60 g (2.1 oz). The incubation period can range from 28 to 38 days. The young leave the nest after about 35 days and start trying to fly another 10 days later. The young may remain in their parents' territory for up to a year of age, at which point sexual maturity is reached.
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