Information specifically about the reproduction of mastiff bats is not well known. However, members of the family Molossidae typically have 1 young and breed once each year. Breeding occurs before ovulation, which occurs in the late winter or early spring. Gestation lasts 70-90 days. The resulting offspring weigh 3-4g but typically do not exceed 22% of the adult weight. (Grzimek 1989, Nowak 1999)
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