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Vagrancy is a phenomenon in biology whereby an individual animal (usually a bird) appears well outside its normal range; [1] they are known as vagrants. The term accidental is sometimes also used.
Some gyrfalcons disperse more widely after the breeding season or in winter, and individual vagrancy can take birds for long distances. Its plumage varies with location, with birds being coloured from all-white to dark brown. These colour variations are called morphs.
Vinicombe is best known for his first book, the Macmillan Field Guide to Bird Identification. Subsequent publications include Rare Birds in Britain and Ireland - a photographic record, co-authored with David Cottridge, in which Vinicombe set out to explain theories about bird vagrancy in Britain and western Europe, including reverse migration. [2]
Retrieved from "https://en.wikipedia.org/w/index.php?title=Vagrant_birds&oldid=844828798"This page was last edited on 7 June 2018, at 12:56 (UTC) (UTC)
A flock of barnacle geese during autumn migration Examples of long-distance bird migration routes. Bird migration is a seasonal movement of birds between breeding and wintering grounds that occurs twice a year. It is typically from north to south or from south to north.
It mainly preys on fish and water birds. The Kamchatka Peninsula in Far Eastern Russia is known for its relatively large population of these birds; about 4,000 of these eagles live there. [5] Steller's sea eagle is listed as vulnerable on the International Union for Conservation of Nature's Red List (IUCN Red List) of threatened species.
Two juvenile birds at Chew Valley Lake, England, in September 1978 and September 1981, were also believed to be hybrids; they showed mixed characters of the two species, specifically a combination of a dark mantle (a feature of white-winged black) with dark patches on the breast-side (a feature of black tern, not shown by white-winged black).
Birds that adopt and continue to migrate in this atypical direction have been called pseudo-vagrancy migrators. Some species are more prone to pseudo-vagrancy migration: yellow-breasted bunting , for example, is considered to be less prone to pseudo-vagrancy than, say, yellow-browed warbler .