Sterne à ventre noir

Identification

The black-bellied tern grows to a length of 32 to 35 cm (13 to 14 in). In the breeding plumage, the crown and nape are black and the upper parts are pale grey. The throat is white and the breast pale grey, gradually darkening to a black belly. The wings are long, slender and pointed and the tail is deeply forked with sharply pointed tips. The bill and feet are yellow or orange and the iris is reddish brown. Outside the breeding season, the belly is whitish, the tail is reduced in length and the bill has a dark tip.

Taxonomie

Nom scientifique

Sterna acuticauda

Autorité

Gray, JE, 1831

Ordre

Charadriiformes

Famille

Laridae

Genre

Sterna

Répartition et habitat

The species occurs mostly in Pakistan, Nepal, India and Bangladesh, with a separate range in Myanmar. Its typical habitat is lowland rivers and marshes, and sometimes ditches and pools, at altitudes of up to about 730 m (2,400 ft). It is an entirely inland species and is not found on the coast.

Migration

Resident species

Comportement

The black-bellied tern has long wings but its flight is slow, with much flapping. It feeds on insects and small fish, skimming over the surface of the water and ground to pick up insects, and plunging obliquely into the water to feed on crustaceans, tadpoles and fish. Breeding takes place from February to April, the nesting site usually being a flat sandy location near a river or lake, a sand spit or a sandy island. It does not nest colonially but may nest with other birds such as river terns (Sterna aurantia), pratincoles (Glareola spp.) and Indian skimmers (Rynchops albicollis).

Conservation

Tendance de la population

declining