Lots of animals engage in homosexual behaviour, but whether they are truly homosexual is another matter entirely. Several observations indicate that male—male sexual preference in rams is sexually motivated. However, gay animal you look at the animal kingdom as a whole, especially those critters who are free to roam gay animal without the confines of gay animal human home, the idea of dogs and cats exhibiting homosexual behavior is something that deserves closer attention.
The endocrine blocking feature of mercury has been suggested as a possible cause of sexual disruption in other bird species.
In fact, studies say gay sex accounts for more than 90 percent of all observed sexual activity in giraffes. If two bonobos approach a cardboard box thrown into their enclosure, they will briefly mount each other before playing with the box.
So LeVay and Vasey still say that humans are the only documented case of "true" homosexuality in wild animals. They often mount each other, and go so far as depositing sperm. Irreconcilable Differences? New Zealand.