Can animals be homosexual?

I am one of those who is not fully persuaded by either side of the debate on homosexuality. I've been interested to hear that some people have found some examples of homosexual behaviours in animals and used them to argue that they support various views when applied to humans. It's never struck me as a good line to take, this sums up why: "occasional homosexual behaviour is not the same as exclusive homosexuality. 'The issue is complicated because we don't know anything about the eroticism in the heads of animals,' says Linda Wolfe, head of anthropology at East Carolina University."

In fact there's a lot to be said for this 'common-sense' view: "According to the Wolfe, the explanation may be little more than animals seeking sexual pleasure. "
So shall we leave this argument out then?
Guardian Unlimited | Life | Can animals be homosexual?: