Homosexual activity in the animal kingdom:
http://www.salon.com/it/feature/1999...5featurea.html
" There are homosexual and bisexual animals, ranging from charismatic megafauna like mountain gorillas to cats, dogs and guinea pigs. There are transgendered animals, transvestite animals (who adopt the behavior of the other gender but don't have sex with their own), and animals who live in bisexual triads and quartets."