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Larus ridibundus


Larus ridibundus
Photo Information
Copyright: Grosu Lucian (Luke) Silver Note Writer [C: 1 W: 0 N: 10] (44)
Genre: Animals
Medium: Color
Date Taken: 2010-09-16
Categories: Birds
Camera: Canon EOS 1000D, Sigma 70-300mm F4-5.6 DG Macro
Exposure: f/5.6, 1/500 seconds
More Photo Info: [view]
Photo Version: Original Version
Date Submitted: 2010-10-08 4:42
Viewed: 2691
Points: 0
[Note Guidelines] Photographer's Note
Facts

Kingdom Animalia
Phylum Chordata
Class Aves
Order Charadriiformes
Family Laridae
Genus Larus
Size Length: 35-39 cm
Wingspan: 86-99 cm
Weight 200-400 g
Status

Included in the Birds of Conservation Concern Green List (low conservation concern). Receives general protection in Great Britain under the Wildlife and Countryside Act.

Description

The common name of this species is inaccurate, as adult black-headed gulls have a chocolate-brown head in summer. In winter, this brown hood retreats and the birds have a largely white head with a dark spot behind the eye. Other distinguishing features include the prominent white leading edge of the upper wing, which is visible from a fair distance, the tern-like slender wings and the reddish coloured bill and legs. Juveniles are different in appearance to adults; they have ginger-brown coloured upperparts and a yellowish bill with a black tip. This is a noisy species during the breeding season, producing a loud kwarr call and a short kwup.

Range

TThis gull has a wide global breeding range that extends through the Palaearctic(4).

You can view distribution information for this species at the National Biodiversity Network Gateway.
Habitat

In winter, found in a wide range of habitats including coastal marshes, farmland, rubbish tips, urban parks, gardens and playing fields . Usual breeding habitats include marshes, ponds, lakes, bogs, gravel pits and dry sites next to water bodies, such as sand-dunes and moorland.

Biology

These gregarious birds are usually seen in flocks or small groups. They feed on worms, other soil invertebrates, scraps, rubbish, carrion and fish. During winter, black-headed gulls roost on open water, typically fresh water, although they may occasionally make use of sheltered estuaries.

These gulls nest in colonies, within which pairs defend small territories. They will defend these territories from other birds using ritualised displays. Two to three eggs are produced which are incubated for up to 26 days. After a further 35 days the chicks will have fledged. Black-headed gulls are fairly long lived, with a maximum recorded life-span of 32 years.


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