This gull is recorded across Argentina around rivers, lakes, and wetlands. In breeding plumage its brown hood contrasts with the bright red bill and legs.
It has a white-and-gray body with a vivid red bill and legs. Breeding birds show a brown hood; in nonbreeding plumage the head is whitish with a brown ear spot.
It uses rivers, lakes, and wet grasslands, and can also forage away from water near human activity. Recorded foods include invertebrates and refuse. It gathers in flocks and nests colonially in wet grassland.
An extinction-risk assessment has not been added yet.