- Medium-sized to small gull.
- Unmarked yellow bill.
- Head and underparts white.
- Back medium gray.
- Wingtips black with white spots.
- Legs yellow.
Immature DescriptionJuvenal Plumage: Dirty, grayish brown head, back, and chest. Back feathers with light tips, giving a scaly appearance. Underparts light brownish gray, barred on the flanks. Tail dark brown, with slightly paler base. Wingtips blackish. Bill black. Eyes dark. Legs pinkish.
First Winter (Basic I) Plumage: Like juvenal, but head and belly paler.
First Summer (Alternate I) Plumage:Back gray. Wing coverts worn and white. Head whitish. Wingtips worn and pale.
Second Winter (Basic II) Plumage: Back mostly gray; some feathers brown. Head and neck washed with grayish brown. Tail white with irregular black band near tip. Feathers of wingtips black or blackish, with only small white spots.
- Both Sexes
- Length: 16.1-18.1 in (41-46 cm)
- Weight: 12.7-21.2 oz (360-600 g)
- Wingspan: 42.1-44.9 in (107-114 cm)