The Black-headed Ibis breeds in South Asia and Southeast Asia from Pakistan to India, Sri Lanka east up to Japan. It builds a stick nest in a tree and lays 2-4 eggs. It occurs in marshy wetlands inland and on the coast, where it feeds on various fish, frogs and other water creatures, as well as on insects. Adults are typically 75 cm long and white-plumaged, with some greyer areas on the wings. The bald head, the neck and legs are black. The thick curved bill is dusky yellow. Sexes are similar, but juveniles have whiter necks and a black bill.