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| Yellow-legged gull | |
|---|---|
| Name | Yellow-legged gull |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Larus |
| Species | michahellis |
| Authority | (Naumann, 1840) |
Yellow-legged gull is a large gull of the genus Larus found around the Mediterranean Sea and adjoining regions. It is recognised for its yellow legs, robust bill, and adaptable coastal and urban habits, and has been the subject of taxonomic debate involving closely related taxa across Europe, Africa, and western Asia. The species frequently interacts with human-altered environments and is monitored by ornithological organizations for population trends.
The species was described by Johann Friedrich Naumann and placed in the genus Larus, a group revised by comparative morphology and molecular studies conducted by institutions such as the Natural History Museum, London and universities in Spain and Italy. Molecular phylogenetics involving mitochondrial DNA has clarified relationships among the complex of large white-headed gulls, including links to populations once treated as subspecies or separate species in the Azores, Canary Islands, and Madeira. Taxonomic authorities including the International Ornithologists' Union and national checklists in France and Portugal differ on delimitation of forms such as the southern or western taxa; systematic treatments reference specimens from museum collections at the American Museum of Natural History and the Zoological Museum of Copenhagen.
Historical literature by 19th-century naturalists and later revisions by ornithologists in the British Ornithologists' Club and the Deutsche Ornithologen-Gesellschaft documented morphological variation leading to nomenclatural proposals. Contemporary systematics integrates data from field observations by societies like the Royal Society for the Protection of Birds and genetic analyses published in journals associated with the European Ornithologists' Union.
Adults are large, stocky gulls with a white head and underparts, grey dorsal plumage, and distinct yellow legs; the bill is strong and yellow with a red subterminal spot, a character also noted in comparative descriptions from the Handbook of the Birds of the World and regional faunas. Field guides produced by organizations such as the Royal Society for the Protection of Birds and the Dutch Birding community emphasize wingtip patterning, iris color, and mantle tone for separation from the similar herring gull and great black-backed gull. Juveniles and immatures show mottled brown plumage and darker legs that gradually pale; museum-based studies at the Natural History Museum, Tring document the sequence of plumage changes across years. Vocalizations—harsh cries and mewing notes—are described in sound archives maintained by institutions like the Macaulay Library and used in identification by observers in coastal birding groups.
The species breeds on coasts and islands of the Mediterranean Sea, extends along the Atlantic coasts of southwestern Europe and northwestern Africa, and reaches parts of western Asia; range maps in regional atlases by the European Bird Census Council and national agencies illustrate breeding and wintering distributions. Habitats include rocky shores, cliffs, harbors, beaches, estuaries, saltmarshes, and increasingly urban centers such as ports and city rooftops documented in studies by municipal wildlife programs in Barcelona, Lisbon, and Marseille. Seasonal movements and vagrancy to northern Europe and offshore islands have been recorded by ringing schemes coordinated by the European Seabirds at Sea partnership and national ringing centres.
The gull exhibits colonial breeding behavior on islands and coastal ledges, with colonies monitored by conservation organizations including BirdLife International partners and local ornithological societies. Social foraging, kleptoparasitism, and complex dominance interactions have been described in ecological studies conducted by universities in Greece and Turkey. Roosting aggregations on tidal flats and urban structures are subject to disturbance from tourism and port activities, with behavioral plasticity enabling exploitation of anthropogenic food sources; behavioral ecology research often references long-term monitoring by the Mediterranean Seabird Project and regional universities.
Feeding is opportunistic and omnivorous, encompassing fish, crustaceans, molluscs, insect prey, small vertebrates, eggs and chicks of other seabirds, refuse from urban waste sites, and discards from fishing vessels—feeding habits documented in dietary studies by marine research institutes in Spain and the Institut National de la Recherche Halieutique in Morocco. Foraging techniques include surface dipping, plunge-diving, scavenging at quay sides, and predatory attacks on intertidal fauna; trophic interactions and contaminant transfer have been investigated in collaborations between the University of Lisbon and the Spanish National Research Council.
Breeding typically occurs in spring and summer with nests built of vegetation and debris on cliffs, islets, rooftops, or flat ground; clutch size, incubation, and chick-rearing parameters are reported in colony studies by municipal wildlife services in Genoa and research teams from the University of Murcia. Adults exhibit biparental care, incubation periods of approximately four weeks, and fledging after several weeks, with juvenile survival influenced by food availability and human disturbance; life-history data are compiled in regional reports by conservation NGOs and academic journals of avian biology.
The species is assessed by the IUCN and national red lists; population trends show regional increases where urbanization and landfill availability provide food, and local declines where disturbance, pollution, and overfishing reduce resources. Conservation measures include management of nesting sites by local authorities, waste control in port cities, mitigation of human disturbance on breeding islands, and monitoring by networks such as the European Seabirds at Sea project and national bird atlases. Conflicts with fisheries and urban residents have prompted policy responses by municipal councils and environmental agencies, and research on disease, contaminants, and human-wildlife interactions continues through collaborations among universities and NGOs.
Category:Larus Category:Birds of Europe Category:Birds of Africa Category:Birds described in 1840