As with many other gulls, it has traditionally been placed in the genus Larus, but based on phylogenetic work some have moved it to Chroicocephalus, while others argue it is sufficiently distinct for placement in the monotypic Saundersilarus.

[3] It is threatened by habitat loss, particularly by conversion of saltmarsh to agricultural land or fish farms, and industrial development including oil extraction.

Non-breeding birds have a mottled grey hood and nape, and white-tipped wings with black markings on the primaries.

It overwinters in southern China, Hong Kong, Macau, Taiwan, South Korea, southwestern Japan and Vietnam.

Its winter habitats are estuaries and aquaculture ponds and some populations move inland to lakes and marshes.

It is a poor swimmer, having only partially webbed feet, and usually stays on land, moving up the beach in front of the rising tide.