Scientific research needs proper funding. There will never be the money to research the sexual orientations of all 5000+ mammalian species.Dulcinea said:That is hardly all mammal species (I'd guess less than 0.01% if I had to pull a random number that sounds small, lol) and those penguins aren't homosexual. No more than two men living together and raising a baby are gay. Homosexuality means being sexually attracted to solely the same sex as yourself.Typhon1388 said:http://en.wikipedia.org/wiki/List_of_animals_displaying_homosexual_behaviorDulcinea said:Any references or sources that prove all mammal species have homosexual members, or that homosexual wild animals reproduce?Bara_no_Hime said:All mammals have homosexual members
Wikipedia is not the best place for solid information but just follow the links in the article's Bibliography to confirm what it states.
That page also mentions Roy and Silo. The 'gay' penguin males who raised an egg together, then separated after 6 years with one of them moving onto a heterosexual pairing. Fairly solid proof for a lot of the questions being asked in this thread.
Instances like this are as close as you will get to identifying it. Bisexual behavior consists of homosexual behavior and a pedantic stance over language doesn't further the debate. I doubt the time and money will ever be devoted to prove any animal (including humans) was 'purely' homosexual throughout its life span.