Two lion brothers rubbing heads in sign of affection and bonding© RichartPhotos/Shutterstock.com Scientists have recorded same-sex behavior across many animal groups ...

In examining the mating rituals of roundworms, researchers uncovered a unique approach to reproduction that maximizes genetic fitness. Sparks fly when a female nematode meets her mate in a Petri dish.

The piece of Russian amber allowed scientists to recreate the ancient scene from the past and understand current animal behavior. The fossil, found in Kaliningrad, Russia, is a "unicorn" because it ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. Sexuality and gender are often at the forefront of cultural and political debate today. In his new book, The Sexual ...

We often seek human-driven guidance when it comes to dating, but since relationships can be a jungle, maybe there's something to be learned from courtship and mating in the wild. My new book, Wild ...

Scientists have recorded same-sex behavior across many animal groups, including mammals, birds, and reptiles. Still, the meaning of that behavior depends on the species and the context. Behavior that ...