Chicks leave the nest after two weeks, although they do not go far. Although widespread across one of the most cosmopolitan ranges among herons, the Black-crowned Night-Heron’s nesting is limited to a few areas in most regions. With its bill down, it gives Plop calls, which can go on for many minutes. Additional observations in the field are needed. The nocturnal habit of the species must, however, break down during nesting. Local disturbance, especially at egg laying, can provoke abandonment of the nests (Tremblay and Ellison 1979, Parsons and Burger 1982, Marion et al. Chronic contamination can still occur where persistent pesticides are still being applied (Henny and Blus 1986). Broad front movements cross the Mediterranean and Sahara to tropical Africa. As a breeding bird, the Black-crowned Night-Heron is mostly limited to the central and southern Columbia Basin, where it is common in appropriate habitat. Between songs it does Preening to its belly and Twig Shaking. The young may be aggressive, defecating or regurgitating on human intruders. Feeding throughout the night avoids competition with herons that use the same habitat during the day. 1997). It has relatively short legs and neck for standing in a crouched posture close to the water. https://www.birdsandblooms.com/birding/bird-species/herons-egrets Colonies are on islands protected from predators and often—although not necessarily—away from human disturbance. As it is unable to secure sufficient food for itself and its young foraging only at night, so it must feed during the day, on larger, scarcer prey in competition with the day-feeding herons, to which it is subordinate. These birds breed in colonies, their stick nests usually being built over water. The loss of habitat in Europe led to a population collapse, and the creation of fish farms, rice fields, and polders brought it back. Breeding takes place in April–June in Canada, March–July in east United States, July–August in Costa Rica, April–June in southern Europe and North Africa, April and August–September in Ethiopia, December–January and again April–June in East Africa, November–May in DR Congo, January–April in Zambia, August–March peaking September–January in southern Africa, August–January peaking November–December in Madagascar, December–April in East Java, February–July in West Java. Its two behaviours produce different results, with Walking being better for small abundant prey and Standing better for larger prey. In the Middle East, Israel has 2,000 pairs nesting (Paz 1987) and the species appears to be increasing its range including in the Arabian Peninsula using artificial wetlands (Perennou et al. Throughout most of its range ( Fasola et al this is a stocky dark grey and heron..., 75 % in China ( M. Fasola pers using Standing, Preening,,! 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