Bats are one of those species that particularly stand out, not just because they are the only mammals that can fly, but also because their 1,400-and-a-few species, found in nearly every corner of the planet, are continuously studied for their exceptional qualities.
As it turns out, bats have newly discovered unique traits; some of their species can mate without penetration, a practice that has never been seen before in other mammals.
The species in question, the serotine bats, also known by the scientific name Eptesicus serotinus, seemingly mate by simply touching genitals.