Burt (1943: 351) defined an animal's home range as that area traversed by an individual in its normal activities of food gathering, mating, and caring for young. Occasional sallies outside the area, perhaps exploratory in nature, should not be considered part of the home range.
This definition is useful and has lasted well because it tells us what a home range is and what its biological basis is. But to estimate animals' home ranges in these terms, one must be able to follow the movements of known individuals, and that is not always easy.
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