Gulls, Terns (Family Laridae)

Gulls (often informally called seagulls) are birds in the Family Laridae.
They are most closely related to the terns (Family Sternidae) and only
distantly related to auks, skimmers, and more distantly to the waders.

They are typically medium to large birds, usually grey or white, often
with black markings on the head or wings. They typically have harsh
wailing or squawking calls. They have stout, longish bills, and webbed
feet. Gull species range in size from the little gull, at 120 g (4.2 oz) and
29 cm (11.5 inches), to the great blackbacked gull, at 1.75 kg (3.8 lbs)
and 76 cm (30 inches).

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