Great Black-headed Gulls breed from the Black Sea region east to Mongolia and move south for winter. In Hong Kong, they have been recorded on an estuary mudflat during winter and passage periods.
Adult birds have a black hood in breeding plumage; in winter, the dark area on the head becomes smaller and greyer.
It moves between breeding areas and more southerly wintering grounds. In Hong Kong, it has been recorded at Deep Bay mudflats in winter and during spring passage.
An extinction-risk assessment has not been added yet.