Far from making a case that homosexuality is normal in the animal kingdom, this article proves the opposite. 1,500 species displays some form of same-sex behavior? Considering there are AT LEAST 8.7 million species, homosexuality would be scientifically considered absolutely ABNORMAL, just as it clearly is with humanity.
I think the homosexuality apologetics really need to look up the definition of "normal" before attempting to make any sort of argument that their sexual confusion/mental illness/perversion (pick one or more) is, in fact, normal.