Bats (Pipistrellus abramus) were artificially reared on a bait of water and flies of medical importance. 1) Bats captured alive in spring were very poor in vitality and could only survive for ten or more days on that bait. 2) Of bats captured alive in summer and early autumn, about 80% maintained their existence until the next spring, and some could survive for more than one year on the bait. 3) The rearing of female bats was more difficult than that of male ones. 4) The propagation of bats ended in failure by this method of rearing. 5) The most unfavorable factor in the artificial rearing of bats was found to be an anaemia by blood-sucking ectoparasites.
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