Male broad-winged bats have huge penises, so reproduction requires no penetration. Researchers have now observed for the first time how this works.
Jan Jeucker and Nicolas Fasel must be real bat fans. There is no other explanation for the fact that the amateur researcher Jeucker, with infinite patience, recorded 93 pairs of broad-winged bats from the smooth-nosed family in the dark of a Dutch church. And Fasel, a biologist at the University of Lausanne, then looked at all the close-ups.