from one Argentinian clutch weighed 70-80 g. From one colony in Buenos Aires, incubation was estimated as 24–26 days. However, in one Chilean colony where eggs hatched in September (spring), incubation period was estimated as 27 days, ranging 26–29 days. Clutch size is 1 to 4 eggs. Juveniles may remain in the nest for up to 12 to 13 weeks, but most leave at 6 to 7 weeks. Threats Alongside human inference, one natural threat may be posed by crested caracara. In a colony in Buenos Aires, the young in a caracara nest hatched before that of the cocoi heron in a nearby nest. The former were reared largely on the heron chicks. Conservation The cocoi heron is classified by the IUCN as least concern because of its extensive geographical range, apparently stable population trend and large population size. Individuals in some territories are affected by agrochemicals, environmental modification and human interference with nests and eggs, but these issues do not constitute severely harmful threats and do not threaten the species with extinction. References cocoi heron cocoi heron Birds of South America cocoi heron cocoi heron Taxonomy articles created by Polbot