"Wrong" is a value judgment, and thus has no place in describing the behavior of animals in natural environments. Some behaviors and charactersitics are better adapted to survival and others are not, and those that are not adapted to survival tend to be eliminated or reduced through natural selection. In many mammal species, only the biggest, stronges male gets to mate. This does not mean that those that are not mating are engaging in behaviors that are "wrong", just that it is not necessary for them to do so to propagate the species. In many insect species, only one female in many generations is capable of reproducing, and only one male in each generation reproduces. This does not mean that behavoirs that do not promote reproduction are wrong, just that they are not necessary to propagation of the species.
Homosexuality does not promote reproduction, but that does not make it wrong either biologically or morally, it just means that homosexual behaviors are not necessary to the propagation of the species. So long as the reproductive members of a species reproduce sufficently to maintain the species population--the queen in insect hives, the alpha male in many mammals, heterosexuals in humans--the species continues.
Homosexuality is nothing more than the far end of the spectrum, and is harmless at both the species and individual level.
Gilda
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