The Malagasy pond heron (Ardeola idae), also known as the Madagascar pond heron or Madagascar squacco heron, is a species of heron of the family Ardeidae. They breed in Madagascar, Réunion and the Seychells, and spend the non-breeding season in eastern mainland Africa. The population is estimated to number only 1,300–4,000 adults and the species is considered endangered. Taxonomy The Malagasy pond heron was first described in 1860 by German physician and ornithologist Gustav Hartlaub. The species is monotypic, without distinct subspecies. Description Malagasy pond herons grow to in height and anywhere from in weight. There is not a large variation in weight between the sexes as they are quite similar in bone body structure. feather, eye, and bill colour are determined by life stage (chick, juvenile, and adult) and reproductive status. The adults appearance can be split into the non-breeding plumage and the breeding stage. When the species is not breeding, the crown and the posterior are a colour mixture of buff and black with brown prominent over the other parts of the body. The bill is predominately green with a black tip whilst the iris is yellow. The flight feathers are clearly seen in flight and for the most part are white. The feathers on the lower mantle and upper scapulars are loosely structured and elongated. Moreover, the lower foreneck feathers are split into fine elongated tips which cover the upper breast. The primary difference of appearance in the breeding stage is the dominance of a snow white colour over the body a bill of a deep azure blue. When coming out of breeding, an intermediate plumage emerges on the back, and dense plumes sprouting on areas such as the neck and breast. Prior to adulthood, the Malagasy pond heron will possess a juvenile plumage just before leaving the nest, lasting a few weeks. The juvenile differs from the adult in having a dull orange bill and pale green eyes. The one distinguishing feature of the chick is its thick buff yellow down. Vocalisation As they often hide in trees and shrubs at the sight of a human disturbance, distinguishing calls between species is often difficult. The Malagasy pond heron possesses two calls: a flight call and a burr call. The flight call has a duration of 0.5 s and is used at 5 second intervals as a means to keep distances between other birds in flight. The