Sterna aurantia
The River Tern, *Sterna aurantia*, is a striking medium-sized tern endemic to freshwater ecosystems across the Indian Subcontinent and Southeast Asia. Measuring approximately 38-46 cm in length with a wingspan of 96-105 cm, its most distinctive feature is its brilliant orange-yellow to deep orange-red bill, which contrasts sharply with its overall white body plumage and pale grey upperparts. In breeding plumage, it sports a glossy black cap extending to the nape, while non-breeding adults dev...
This species exclusively inhabits large freshwater rivers, lakes, and reservoirs, preferring open areas with extensive sandbars, shingle banks, or rocky islands for nesting and roosting. It is typically found in lowland and plains regions, rarely venturing to higher elevations.
The River Tern feeds predominantly on small to medium-sized fish, which it expertly catches by plunge-diving into freshwater bodies. Occasionally, it may also consume aquatic insects.
River Terns are highly social, typically foraging during the day and roosting colonially on sandbars or islands. Their primary foraging strategy involves plunge-diving, where they hover over the water before plummeting headfirst to snatch fish from just below the surface. During the breeding seas...
The River Tern's breeding and resident range spans across the major river systems of the Indian Subcontinent and Southeast Asia. In the Indian Subcontinent, it breeds widely across India, Pakistan, Bangladesh, and Nepal, primarily along the Indus, Ganges, Brahmaputra, and Mahanadi river basins. I...
Endangered
- The River Tern's bright orange-red bill intensifies in color during the breeding season, serving as a display of health and fitness to potential mates. - They are one of the few tern species almost entirely restricted to freshwater habitats, rarely seen on coastal waters. - Breeding colonies ca...