DistributionThe pattern of occurrence of a species as seen when plotted on a map, also known as its 'range'. Each species has a 'breeding distribution', which only coincides with its distribution in winter if the species is truly sedentary, as are few birds outside the tropics. A species which is wholly a summer visitor to the British Isles is likely to have completely separate breeding and wintering distributions, for example the Swallow Hirundo rustica, occurring in the intervening regions only on passage.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver