įor these mammals, there is documented evidence of homosexual behavior of one or more of the following kinds: sexual behavior, courtship, affection, pair bonding, or parenting.īruce Bagemihl writes that the presence of same-sex sexual behavior was not officially observed on a large scale until the 1990s due to possible observer bias caused by social attitudes towards LGBT people, which made homosexuality in animals a taboo subject. Giraffes in Kenya giraffes have been called 'especially gay' for often engaging in male-male sexual behavior more than male-female ( heterosexual) sex.