Distribution
The 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.From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver