People keep citing gay penguins in zoos as justification for human homosexuality. Here is another story.
I guess that it is possible that animal studies might illuminate human behavior. It would be interesting if animals with a homosexual orientation could be found. Most penguins mate for life. Apparently zoo penguins will choose a mate of the same sex if none of the opposite sex are available. If the gay penguins really had a homosexual orientation, then they'd prefer a mate of the same sex even when there are plenty of the opposite sex available. No one has observed that.