by Bruce Bagemihl

About the author: Bruce Bagemihl is a biologist, researcher, and author of several books on biology and sexuality, including Biological Exuberance: Animal Homosexuality and Natural Diversity, from which this excerpt was taken.

Titus and Ahab—male Gorillas—often courted and had sex with one another in the mountains of Rwanda, while Marchessa sought out her own sex during her pregnancy. In Florida, Bottlenose Dolphins Frank, Floyd, and Algie participated in homosexual activity with each other, as did Gabe and Moe-Miller, West Indian Manatees. Les and Sam (Siamangs) were doing the same in Milwaukee, while Kiku, a female Bonobo living in Congo (Zaire), had sex with her female “mentor” Halu more often than with anyone else in the new troop she joined. Cato and Mola (male Crested Black Macaques...