(CNN) — Bats have long been the odd ones out among mammals. They are the only creatures in this branch of the animal kingdom capable of powered flight. Now researchers say they have discovered another ...

The white-handed gibbon comes closest to humans in the study, with a monogamy rate of 63.5%. It’s the only other top-ranked ...

Bats with "disproportionately large" penises that don't fit inside the females' vaginas are the only mammals known to have sex without penetration, scientists have discovered. Mammals usually mate via ...

Some animals reproduce only once before dying. This life strategy, called semelparity, sees organisms channel all energy into ...

In the animal kingdom, mating isn’t always about survival. From praying mantises to octopuses, some species die during or ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Bats have long been ...