Lesser black-backed gull
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The lesser black-backed gull (Larus fuscus) is a large gull that breeds on the Atlantic coasts of Europe. It is migratory, wintering from the British Isles south to West Africa. However, it has increased dramatically in North America, especially along the east coast. Formerly just a winter visitor to North America, it has increased and occurs in large numbers some winters and birds are now recorded year-round.<ref name=":0">Template:Cite journal</ref> However, there is serious concern about decline in many parts of its range. The species is on the UK Amber List<ref name=":1">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> because the UK is home to 40 per cent of the European population and more than half of these are found at fewer than ten breeding sites.<ref name=":1" />
TaxonomyEdit
The lesser black-backed gull was one of the many species originally described by Carl Linnaeus in his 1758 10th edition of Systema Naturae, and it still bears its original name Larus fuscus.<ref name=Linnaeus1758>Template:Cite book</ref> The scientific name is from Latin. Larus appears to have referred to a gull or other large seabird, and fuscus meant black or brown.<ref name=job>Template:Cite book</ref>
SubspeciesEdit
The five recognized subspecies are:
| Image | Subspecies | Distribution |
|---|---|---|
| File:Larus fuscus on the wall of Mont St Michel.jpg | L. f. graellsii Brehm, 1857 | Greenland, Iceland, Faroe Islands, British Isles, western Europe - mantle dark grey |
| File:Larus fuscus EM1B1660 (40890382754).jpg | L. f. intermedius Schiøler, 1922 | Netherlands, Germany, Denmark, southwest Sweden and western Norway - mantle sooty black |
| File:Larus fuscus, a gull in Helsinki, Finland, 2020 August.jpg | L. f. fuscus Linnaeus, 1758 | northern Norway, Sweden and Finland to the White Sea - mantle jet black |
| File:Sea-Gull.jpg | L. f. heuglini Bree, 1876 | northern Russia to north-central Siberia, known as Heuglin's gull, this was previously considered a separate species. |
| File:Чайка на фоне оголившихся корней сосны.jpg | L. f. barabensis Johansen, 1960 | central Asia |
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DescriptionEdit
The lesser black-backed gull is smaller than the European herring gull. The taxonomy of the herring gull / lesser black-backed gull complex is very complicated; different authorities recognise between two and eight species. This group has a ring species distribution around the Northern Hemisphere. Differences between adjacent forms in this ring are fairly small, but by the time the circuit is completed, the end members, herring gull and lesser black-backed gull, are clearly different species. The lesser black-backed gull measures Template:Convert, Template:Convert across the wings, and weighs Template:Convert, with the nominate race averaging slightly smaller than the other two subspecies.<ref name=AAB/> Males, at an average weight of Template:Convert, are slightly larger than females, at an average of Template:Convert. Among standard measurements, the wing chord is Template:Convert, the bill is Template:Convert, and the tarsus is Template:Convert.<ref name=Olsen2004/><ref name=Harrison1991/><ref name=CRC/> A confusable species is the great black-backed gull. The lesser is a much smaller bird, with slimmer build, yellow rather than pinkish legs, and smaller white "mirrors" at the wing tips. The adults have black or dark grey wings (depending on race) and back. The bill is yellow with a red spot at which the young peck, inducing feeding (see fixed action pattern). The head is greyer in winter, unlike great black-backed gulls. Annual moult for adults begins between May and August and is not complete on some birds until November. Partial prebreeding moult occurs between January and April.<ref>RSPB Handbook of British Birds (2014). UK Template:ISBN</ref>
Young birds have scaly black-brown upperparts and a neat wing pattern. They take four years to reach maturity. Identification from juvenile herring gulls is most readily done by the more solidly dark (unbarred) tertial feathers.
Their call is a "laughing" cry like that of the herring gull, but with a markedly deeper pitch.
DistributionEdit
Lesser black-backed gulls have expanded their range westwards, first colonising Greenland in the 1980s. The species has not yet bred in the United States, although hybrid pairs with American herring gulls have been recorded twice.<ref name=":0" />
BreedingEdit
This species breeds colonially on coasts and lakes, making a lined nest on the ground or a cliff. Normally, three eggs are laid. In some cities, the species nests within the urban environment, often in association with herring gulls.<ref name=thisbrighton/>
FeedingEdit
They are omnivores like most Larus gulls, and they eat fish, insects, crustaceans, worms, starfish, molluscs, seeds, berries, small mammals, eggs, small birds, chicks, scraps, offal, and carrion.
GalleryEdit
- Lesser black-backed gull (Larus fuscus intermedius) in flight composite.jpg
L. f. intermedius in flight, Sweden
- Goeland adulte et juvénile.jpg
Mother gull and her baby
- Lesser black-backed gull 2015.jpg
Close up
- Lesser black-backed gull (Larus fuscus graellsii).jpg
L. f. graellsii adult, Morocco
- Lesser black-backed gull (Larus fuscus graellsii) young adult in flight.jpg
L. f. graellsii young adult, Morocco
- Lesser black-backed gull (Larus fuscus graellsii) juvenile in flight Sagres.jpg
L. f. graellsii juvenile, Portugal
- Silltrut-Larus fuscus-1cy-Ystad-2009.jpg
First cycle plumage
- Lesser Black-backed Gulls.jpg
Flying in a lake near the city hall in Reykjavik
- Lesser Black-backed Gull from the Crossley ID Guide Britain and Ireland.jpg
ID composite
- Larus fuscus fuscus MHNT.ZOO.2010.11.124.3.jpg
Larus fuscus fuscus - MHNT