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By using a simulated mine tunnel, the average speed and individual variation of 17 western bats were determined. Eptesicus fuscus showed the maximum speed of those tested (15.5 mph), whereas Pipistrellus hesperus showed the minimum value (4.8 mph). In many species speed of flight is correlated with the size of the bat.
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Hayward et al. (1964) studied this question.
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