Bats of the family Emballonuridae usually give birth to a single offspring per year. Exceptions to this rule may be small species like the proboscis bat that reproduce twice each year. Most emballonurid bats show a seasonal pattern of reproduction with females giving birth to their offspring at the beginning of the rainy season. Sperm storage or delayed embryonic development occurs in some Old World members within the family Emballonuridae. The mating system varies by species.
Emballonurid bats exhibit a variety of different mating systems. Similar to other mammalian groups, polygynous mating patterns are most common. However, exceptions are for example the monogamous mating system of Cormura brevirostris and possibly also of the greater dog-faced bat, Peropteryx kappleri, and some members of the genus Tapho-zous. The proboscis bat is considered to have a promiscuous mating pattern. Among emballonurid bats, the greater sac-winged bat, Saccopteryx bilineata, is the best studied species.
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