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Upper canine teeth of little brown bats Myotis lucifugus lucifugus held in stainless steel wire mesh cages underwent severe wear which exceeded that observed previously in caged big brown bats, Eptesicus fuscus fuscus. This suggests a relationship between amount of wear and size of the caged bats with damage increasing as size decreases. Rapid wear of canine teeth by little brown bats resembled that observed in big brown bats in that it was limited to the first 2 weeks of captivity. This result indicates a universal interval for acclimation to cage conditions among vespertilionid bats. Dietary toxicants DDE and PCB did not affect the extent of wear. If bats are to be released to the wild, confinement in wire mesh cages should be avoided.