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 ...

Sexuality and gender are often at the forefront of cultural and political debate today. In his new book, The Sexual Evolution: How 500 Million Years of Sex, Gender, and Mating Shape Modern ...

In the animal kingdom, penises can be spiked, split, corkscrewed—even detachable. They're one of the most diverse structures in biology. The human penis is so uniform, it's an anatomical outlier.

Some sanctuaries offer shelter; The Wild Animal Sanctuary in Keenesburg, Colorado, offers rescued animals a place to reclaim their wild spirit. With more than 1,200 acres of land, it’s a refuge for ...