Chroicocephalus
- Brown-headed Gull Chroicocephalus brunnicephalus
The Brown-headed Gull develops a brown head in breeding plumage. It moves between its breeding range and wintering areas with the seasons.
- Black-billed Gull Chroicocephalus bulleri
The Black-billed Gull is a slender gull found only in New Zealand. It breeds on gravelly riverbeds and uses rivers or coasts at different times of year.
- Gray-hooded Gull Chroicocephalus cirrocephalus
Adults of the South American nominate subspecies show a pale grey hood in breeding plumage.
- Slender-billed Gull Chroicocephalus genei
A gull with a slender bill and legs and a low forehead.
- Hartlaub's Gull Chroicocephalus hartlaubii
Hartlaub's Gull is a small coastal gull of southern Africa. Its head and bill colors change as it matures.
- Brown-hooded Gull Chroicocephalus maculipennis
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.
- Silver Gull Chroicocephalus novaehollandiae
The Silver Gull has a white head and red-orange bill and legs. It searches for food along coasts and around urban waters in Australia.
- Bonaparte's Gull Chroicocephalus philadelphia
This small North American gull breeds in northern forests in summer and winters farther south along coasts, lakes, and rivers.
- Black-headed gull Chroicocephalus ridibundus
A gull that gathers around watersides and visits Japan mainly in winter.
- Saunders's Gull Chroicocephalus saundersi
It breeds in Yellow Sea coastal saltmarshes, mainly in eastern China and occasionally on the southwestern coast of South Korea. Outside the breeding season it moves to coasts of eastern China, Japan, Taiwan and Korea.
- Andean Gull Chroicocephalus serranus
This medium-sized gull changes its head pattern between breeding and non-breeding plumage. It uses Andean lakes and rivers; in Chile, some move down to the coast in winter.
- Black-headed gull Chroicocephalus ridibundus
A gull that gathers around watersides and visits Japan mainly in winter.
- Slender-billed Gull Chroicocephalus genei
A gull with a slender bill and legs and a low forehead.
- Bonaparte's Gull Chroicocephalus philadelphia
This small North American gull breeds in northern forests in summer and winters farther south along coasts, lakes, and rivers.
- Brown-headed Gull Chroicocephalus brunnicephalus
The Brown-headed Gull develops a brown head in breeding plumage. It moves between its breeding range and wintering areas with the seasons.
- Gray-hooded Gull Chroicocephalus cirrocephalus
Adults of the South American nominate subspecies show a pale grey hood in breeding plumage.
- Silver Gull Chroicocephalus novaehollandiae
The Silver Gull has a white head and red-orange bill and legs. It searches for food along coasts and around urban waters in Australia.
- Hartlaub's Gull Chroicocephalus hartlaubii
Hartlaub's Gull is a small coastal gull of southern Africa. Its head and bill colors change as it matures.
- Black-billed Gull Chroicocephalus bulleri
The Black-billed Gull is a slender gull found only in New Zealand. It breeds on gravelly riverbeds and uses rivers or coasts at different times of year.
- Andean Gull Chroicocephalus serranus
This medium-sized gull changes its head pattern between breeding and non-breeding plumage. It uses Andean lakes and rivers; in Chile, some move down to the coast in winter.
- Saunders's Gull Chroicocephalus saundersi
It breeds in Yellow Sea coastal saltmarshes, mainly in eastern China and occasionally on the southwestern coast of South Korea. Outside the breeding season it moves to coasts of eastern China, Japan, Taiwan and Korea.
- Brown-hooded Gull Chroicocephalus maculipennis
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.