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Lesser Black-backed Gull

From Opus

Adult, likely L.f. graelsiiPhoto by Andy Bright
Adult, likely L.f. graelsii
Photo by Andy Bright

Includes Heuglin's Gull

Larus fuscus

Contents

[edit] Identification

Adult: The Lesser Black-backed Gull is a large white-headed gull which comes into contact with similar species across its range. Nominate L. f. fuscus or Baltic Gull is long-winged with a black mantle and yellow legs in adult plumage differentiating it from similar Herring Gulls (mantle colour, leg colour & wing-length) and Great Black-backed Gulls (leg colour & build).

L. f. heuglini Photo by rafo1
L. f. heuglini
Photo by rafo1

L. f. intermedius is less elegant, having shorter, broader wings than nominate but longer than L. f. graelsii. L. f. graelsii, the subspecies of North-western Europe has a build closer to Herring Gull or Yellow-legged Gull rather than Baltic Gull. It is told from these by its slate grey back, darker than both.

Younger birds: Lesser Black-backed Gull takes four years to reach full adult plumage, starting with a dark and heavily patterned brown and gradually attaining adult characteristics.

[edit] Distribution

A common and widespread gull in the north of the region. Breeds in Iceland, the Faroes and British Isles, in Portugal and north-west Spain and from Brittany to Denmark, coastal Norway and Sweden, inland in Finland and north-west Russia and also on the coast of northern Russia.

Northern and eastern populations are migratory with winter range extending from Britain south to North-West Africa and throughout the Mediterranean.

Occurs on passage over much of Central and Western Europe.

Vagrant north to Svalbard and Bear Island and south to the Azores and Armenia.

Juvenile, probably L. f. graellsii Photo by mustapHamilton, Ontario, Canada, September, 2011
Juvenile, probably L. f. graellsii
Photo by mustap
Hamilton, Ontario, Canada, September, 2011

[edit] Taxonomy

The Lesser Black-backed Gull is part of a gull clade called the large white-headed gulls. This includes Yellow-legged Gull, Herring Gull and several other species. The taxonomy of this group is currently being radically remodelled with many species being split. A taxon here included under Lesser Black-backed Gull may be candidate for full species in due course: L. heuglini.

[edit] Subspecies

Four subspecies are recognized[1]:

  • L. f. fuscus: Dark-mantled
  • L. f. intermedius:
  • Denmark to western Norway, locally south to north-eastern Spain; winters to western Africa
  • L. f. graellsii: Larger and paler-mantled
  • L. f. heuglini:
Dark adult in flight, possibly L. f. fuscus Photo by A. MeirEilat, Israel, May 2008
Dark adult in flight, possibly L. f. fuscus
Photo by A. Meir
Eilat, Israel, May 2008

[edit] Habitat

Quite catholic in its choice of habitats, perhaps less so than Herring Gulls, Lesser Black-backed Gulls are commonly found nesting on rooftops in coastal towns and cities as well as more traditional areas such as rocky islands and grass-covered tops of mainland cliffs.

In winter these birds can be found amongst mixed species gull flocks both on the coast and inland, often frequenting landfill sites. On passage these birds can occur anywhere.

[edit] Behaviour

[edit] Diet

Lesser Black-backed Gulls are opportunist feeders, eating anything they can digest and utilising transient food sources. They often use landfills for scavanging during the winter but they will take live prey given the opportunity. This includes molluscs, worms and crustaceans. Like other closely related species, Lesser Black-backed Gulls are omnivorous.

[edit] Vocalisation


Listen in an external program

[edit] References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2014. The eBird/Clements checklist of birds of the world: Version 6.9., with updates to August 2014. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. BF Member observations

[edit] External Links


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