During periods of starvation, they also eat seagulls and ducklings. The gulls are held under water and drowned before being eaten headfirst. A flock of captive great white pelicans in St James's Park, London is well known for occasionally eating local pigeons, despite being well-fed. The breeding season commences in April or May in temperate zones, is essentially all year around in Africa and runs February through April in India. Large numbers of these pelicans breed together in colonies. Nest locations vary: some populations make stick nests in trees but a majority, including all those that breed in Africa, nest exclusively in scrapes on the ground lined with grass, sticks, feathers and other material. The female can lay from 1 to 4 eggs in a clutch, with two being the average. Incubation takes 29 to 36 days. The chicks are naked when they hatch but quickly sprout blackish-brown down. The young are cared for by both parents. The colony gathers in "pods" around 20 to 25 days after the eggs hatch. The young fledge at 65 to 75 days of age. Around 64% of young successful reach adulthood, attaining sexual maturity at 3 to 4 years of age. While white pelicans are often protected from bird-eating raptors by virtue of their own great size, eagles, especially sympatric "Haliaeetus" species, may prey on their eggs, nestlings, and fledglings. Occasionally, pelicans and their young are attacked at their colonies by mammalian carnivores, such as jackals and lions. As is common in pelicans, the close approach of a large predaceous or unknown mammal, including a human, at a colony will lead the pelican to abandon its nest in self-preservation. Additionally, crocodiles, especially Nile crocodiles in Africa, readily kill and eat swimming pelicans. Since 1998, the great white pelican has been rated as a species of least concern on the IUCN Red List of Endangered Species. This is because it has a large range more than 20,000 km2 (7700 mi2) and because its population is thought not to have declined by 30% over ten years or three generations, which is not a rapid enough decline to warrant a vulnerable rating. However, the state of its overall population is not known, and although it is widespread, it is not abundant anywhere. It is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.