Unconventional Mating: Bat's Arm-like Penis Surprises Researchers

Serotine bats, also known as Eptesicus serotinus, have been observed mating without penetration, making them potentially the first mammal known to do so. Researchers analyzed video footage of 93 mating events and found that the male bat uses its penis to move a protective membrane away from the female bat's vulva, resembling a "cloacal kiss" seen in birds. The male bat's penis is longer and wider than the female's vagina, suggesting that penetrative sex may be difficult or impossible. While the study's findings are considered unique and bizarre, further research is needed to definitively prove the transfer of sperm and understand the female's role in the mating process. The information could also aid in developing assisted reproduction strategies for bats, many of which are endangered species.