Big Koniuji Black-legged Kittiwake colony

The kittiwakes (

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

''Rissa'') are two closely related

seabird Seabirds (also known as marine birds) are birds that are adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same envir ...

species in the

gull Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns and skimmers and only distantly related to auks, and even more distantly to waders. Until the 21st century ...

family Laridae, the

black-legged kittiwake The black-legged kittiwake (''Rissa tridactyla'') is a seabird species in the gull family Laridae. This species was first described by Carl Linnaeus in his landmark 1758 10th edition of ''Systema Naturae'' as ''Larus tridactylus''. The English ...

(''Rissa tridactyla'') and the red-legged kittiwake (''Rissa brevirostris''). The

epithet An epithet (, ), also byname, is a descriptive term (word or phrase) known for accompanying or occurring in place of a name and having entered common usage. It has various shades of meaning when applied to seemingly real or fictitious people, di ...

s "black-legged" and "red-legged" are used to distinguish the two species in North America, but in Europe, where ''Rissa brevirostris'' is not found, the black-legged kittiwake is often known simply as kittiwake, or more colloquially in some areas as tickleass or tickleace. The name is derived from its call, a shrill 'kittee-wa-aaake, kitte-wa-aaake'. The genus name ''Rissa'' is from the Icelandic name ''Rita'' for the black-legged kittiwake.

Description

The two species are indeed physically very similar. They have a white head and body, grey back, grey wings tipped solid black and a bright yellow bill. Black-legged kittiwake adults are somewhat larger (roughly in length with a wingspan of ) than red-legged kittiwakes ( in length with a wingspan around ). Other differences include a shorter bill, larger eyes, a larger, rounder head and darker grey wings in the red-legged kittiwake. While most black-legged kittiwakes do, indeed, have dark-grey legs, some have pinkish-grey to reddish legs, making colouration a somewhat unreliable identifying marker. In contrast to the dappled chicks of other gull species, kittiwake chicks are downy and white since they are under relatively little threat of predation, as the nests are on extremely steep cliffs. Unlike other gull chicks which wander around as soon as they can walk, kittiwake chicks instinctively sit still in the nest to avoid falling off. Juveniles take three years to reach maturity. When in winter plumage, both birds have a dark grey smudge behind the eye and a grey hind-neck collar. The sexes are visually indistinguishable.

Distribution and habitat

Kittiwakes are coastal breeding birds ranging in the

North Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...

North Atlantic The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe a ...

, and

Arctic The Arctic ( or ) is a polar regions of Earth, polar region located at the northernmost part of Earth. The Arctic consists of the Arctic Ocean, adjacent seas, and parts of Canada (Yukon, Northwest Territories, Nunavut), Danish Realm (Greenla ...

oceans. They form large, dense, noisy

colonies In modern parlance, a colony is a territory subject to a form of foreign rule. Though dominated by the foreign colonizers, colonies remain separate from the administration of the original country of the colonizers, the '' metropolitan state'' ...

during the summer reproductive period, often sharing habitat with murres. They are the only gull species that are exclusively cliff-nesting. A colony of kittiwakes living in

Newcastle upon Tyne Newcastle upon Tyne ( RP: , ), or simply Newcastle, is a city and metropolitan borough in Tyne and Wear, England. The city is located on the River Tyne's northern bank and forms the largest part of the Tyneside built-up area. Newcastle is ...

and

Gateshead Gateshead () is a large town in northern England. It is on the River Tyne's southern bank, opposite Newcastle to which it is joined by seven bridges. The town contains the Millennium Bridge, The Sage, and the Baltic Centre for Contemporary ...

in the north east of England has made homes on both the

Tyne Bridge The Tyne Bridge is a through arch bridge over the River Tyne in North East England, linking Newcastle upon Tyne and Gateshead. The bridge was designed by the engineering firm Mott, Hay and Anderson, who later designed the Forth Road Bridge, ...

and

Baltic Centre for Contemporary Art Baltic Centre for Contemporary Art (also known simply as (the) Baltic, stylised as BALTIC) is a centre for contemporary art located on the south bank of the River Tyne in Gateshead, Tyne and Wear, England. It hosts a frequently changing variety ...

. This colony is notable because it is the furthest inland colony of kittiwakes in the world.

Species

Photo gallery

File:Kittiwake w.jpg, Kittiwake – winter

Ireland Ireland ( ; ga, Éire ; Ulster-Scots: ) is an island in the North Atlantic Ocean, in north-western Europe. It is separated from Great Britain to its east by the North Channel, the Irish Sea, and St George's Channel. Ireland is the s ...

File:Kittiwake with young chick.jpg, Kittiwake with chicks,

Iceland Iceland ( is, Ísland; ) is a Nordic island country in the North Atlantic Ocean and in the Arctic Ocean. Iceland is the most sparsely populated country in Europe. Iceland's capital and largest city is Reykjavík, which (along with its ...

File:Rissa tridactyla -Staple Island, Farne Islands, Northumberland, England -adult and chicks-8.jpg,

Farne Islands The Farne Islands are a group of islands off the coast of Northumberland, England. The group has between 15 and 20 islands depending on the level of the tide.

, England

References

External links

{{Taxonbar, from=Q310848 Kittiwakes Taxa named by James Francis Stephens