The endangered black-bellied tern (Sterna acuticauda) has a white throat and pale grey breast, gradually darkening to a black belly in the summer. Found near large rivers in the Indian subcontinent, its range extends from Pakistan, Nepal and India to Myanmar. It can resemble the whiskered tern (Chlidonias hybrida), but the deeper fork of the tail and the black on the lower belly distinguish it from the shallow fork and black closer to the breast on the whiskered tern.
Black bellied ternBlack bellied tern