Hybridisation in gulls occurs quite frequently, although to varying degrees depending on the species involved.
Hybrid large white-headed gulls
Herring Gull and Lesser Black-backed Gull interbreed to a limited degree where their ranges overlap, producing birds of intermediate appearance, which could be confused with Yellow-legged Gulls.
To be expanded Binomial name Larus cachinnans Pallas, 1811 The Yellow-legged Gull, Larus cachinnans, is a large gull. ...
Hybrids among the small hooded gulls
The most common hybrid found among gulls in Europe is between Black-headed Gull and Mediterranean Gull. Hybrids of this combination are occasionally reported on the northwestern edge of the breeding range of Meditteranean Gull.
Birds have also been reported in Europe which have been suspected of being Mediterranean Gull × Common Gull hybrids; one such bird gull seen in Lincolnshire in 2002 (Tarrant 2002)
World map showing location of Europe Europe is geologically and geographically a peninsula, forming the westernmost part of Eurasia. ... Binomial name Larus ridibundus Linnaeus, 1766 The Black-headed Gull, (Larus ridibundus), is a small gull which breeds in much of Europe and Asia, and also in coastal eastern Canada. ... Binomial name Larus melanocephalus Temminck, 1820 The Mediterranean Gull, Larus melanocephalus, is a small gull which breeds almost entirely in Europe, mainly in the south east, especially around the Black Sea, and in central Turkey. ... Binomial name Larus canus Linnaeus, 1758 The Common Gull, Larus canus is a medium-sized gull which breeds across North America (where it is called Mew Gull), Europe and Asia. ... Lincolnshire (abbreviated Lincs) is a county in the East Midlands of England, traditionally the second largest after Yorkshire. ...
References
Tarrant, Mike (2002) An apparent hybrid gull in Lincolnshire Birdins World Vol. 15 No. 6 p247
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Gulls — the larger species in particular — are resourceful and highly-intelligent birds, demonstrating complex methods of communication and a highly-developed social structure.
Hybridisation between species of gull occurs quite frequently, although to varying degrees depending on the species involved (see Hybridisation in gulls).
The Swallow-tailed Gull, endemic inhabitant of the Galápagos Islands.
The distinguishing features separating Caspian Gull from commoner gulls are somewhat subtle, and there are pitfalls due to the variability of gulls in size, plumage and bare part colouration, but when good views are obtained it is a distinctive gull and is not exceptionally difficult to identify.
Gulls are extremely variable in appearance, given the progression of plumages as birds age, plus racial and sexual differences in size and colouration.
Gulls are best viewed in profile and a slight breeze will cause resting gulls to orient themselves to face into the wind, both on land and on water, allowing the majority of birds to be viewed at the same angle and reducing the amount of light-dependent variation.
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