The Black-headed Gull (Chroicocephalus ridibundus) is a small gull which breeds in much of Europe and Asia, and also in coastal eastern Canada. Most of the population is migratory, wintering further south, but some birds in the milder westernmost areas of Europe are resident. Some birds will also spend the winter in northeastern North America, where it was formerly known as the Common Black-headed Gull. As is the case with many gulls, it had previously been placed in the genus Larus.
This gull is 38–44 cm (15-17½ in) long with a 94–105 cm (37–41 in) wingspan. In flight, the white leading edge to the wing is a good field mark. The summer adult has a chocolate-brown head (not black, although does look black from a distance), pale grey body, black tips to the primary wing feathers, and red bill and legs. The hood is lost in winter, leaving just 2 dark spots. It breeds in colonies in large reedbeds or marshes, or on islands in lakes, nesting on the ground. Like most gulls, it is highly gregarious in winter, both when feeding or in evening roosts. It is not a pelagic species and is rarely seen at sea far from coasts.
The Black-headed Gull is a bold and opportunist feeder and will eat insects, fish, seeds, worms, scraps and carrion in towns, or take invertebrates in ploughed fields with equal relish. This is a noisy species, especially in colonies, with a familiar "kree-ar" call. Its scientific name means "laughing gull".
This species takes two years to reach maturity. First-year birds have a black terminal tail band, more dark areas in the wings, and, in summer, a less fully developed dark hood. Like most gulls, Black-headed Gulls are long-lived birds, with a maximum age of at least 32.9 years recorded in the wild, in addition to an anecdote now regarded to be of dubious authenticity regarding a 63 year old bird.
In popular culture
In the 1990s, local Broome birder Brian Kane saw a strange species of bird while trawling the local sewer ponds. Upon seeing this bird, he called one of his many bird-watcher friends to verify the species, who confirmed that it was indeed a Black-headed Gull that Brian had stumbled across. This was the first recorded sighting of the species in Australia.
- BirdLife International (2004). Larus ridibundus. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 11 May 2006.
- "Longevity, ageing, and life history of Chroicocephalus ridibundus". The Animal Ageing and Longevity Database. http://genomics.senescence.info/species/entry.php?species=Chroicocephalus_ridibundus. Retrieved 7 November 2012.
- Copping, Jasper (28 March 2009). "Top restaurants face shortage of seagull eggs". The Daily Telegraph (London). http://www.telegraph.co.uk/foodanddrink/foodanddrinknews/5065716/Top-restaurants-face-shortage-of-seagull-eggs.html.
- Conservation (Natural Habitats&c
- Kane, Brian (31 January 2002). "Notes on the Black-headed Gull Larus ridibundus at the Broome Sewage Ponds". Notes on the Black-headed Gull Larus ridibundus at the Broome Sewage Ponds (Broome). http://birdingwa.iinet.net.au/articles/ar199101.htm.
- Harrison P. Seabirds of the World. Princeton University Press, Princeton (NJ), 1987 ISBN 0-691-01551-1
- Dunn JL, Alderfer J. National Geographic Field Guide to the Birds of North America National Geographic Society 2006 ISBN 0-7922-6877-6
- Pons J.M., Hassanin, A., and Crochet P.A.(2005). Phylogenetic relationships within the Laridae (Charadriiformes: Aves) inferred from mitochondrial markers. Molecular phylogenetics and evolution 37(3):686-699