Gull

Gulls or Seagulls are seabirds of the family Laridae 
Gulls are medium to large birds, grey or white with black markings on the head or wings. They have harsh wailing or squawking calls, longish bills, and webbed feet. Large white-headed gulls are typically long-lived birds, with a maximum age of 49 years recorded for the herring gull.
Gulls nest in colonies. They lay two or three speckled eggs in nests composed of vegetation. The young are born with dark mottled down and mobile upon hatching.
Description
Gulls range in size from the Little gull to the Great black-backed gull They are generally uniform in shape, with heavy bodies, long wings, and long necks. The tails of all but three species are rounded. Gulls have long legs, especially when compared to the similar terns, with fully webbed feet. The bill is generally heavy and slightly hooked, with the larger species having stouter bills than the smaller species. The bill colour is yellow with a red spot for the larger white-headed species and red, dark red or black in the smaller species.
Distribution and habitat
The gulls have a worldwide cosmopolitan distribution. They breed on every continent, including Antarctica, and are found in the high Arctic as well. They are less common on tropical islands, although a few species do live on islands such as the Galapagos and New Caledonia. Many species breed in coastal colonies, with a preference for islands, and one species, the grey gull, breeds in dry deserts far from water. Considerable variety exists in the family and species may breed and feed in marine, freshwater, or terrestrial habitats.
Most gull species are migratory, with birds moving to warmer habitats during the winter, but the extent to which they migrate varies by species. Some migrate long distances, like Franklin's gull, which migrates from Canada to wintering grounds in the south of South America. Other species move much shorter distances and may simply disperse along the coasts near their breeding sites.
Behaviour
Diet And Feeding
Gulls drink salt water, as well as fresh water. Gulls are highly adaptable feeders that take a wide range of prey. The food taken by gulls includes fish and sea creatures, both alive and already dead, terrestrial arthropods and invertebrates such as insects and earthworms, rodents, eggs, carrion, offal, reptiles, amphibians, plant items such as seeds and fruit, food, chips, and even other birds.