I went and read all those sites, and yet none of them gave any proof to homosexuality in animals, all I seen was someone seen this or someone seen that. I would like to see another dog try and stick his willie in my male Rotties, I can tell you if that happened and the other dog was gay it wouldn't be for long, death has a way of remedying those things. How about one Grizzle trying the same thing with another, yeah boy, death on the mountain. Male and female penguins share egg sitting duties, no big deal there, males find abandoned eggs and get busy doing what comes natural. I'm sure explanations can be found for the others. One thing I noticed, none of those who said they observed these things gave any video evidence, just a bunch of jabber.
Now for argument sake let's say it's true, these animals that would be gay can not reproduce and since this is a truth, well they can not reproduce and pass on the genetics to produce more gays. So if evolution was true then this would eventually eliminate the genetics that would cause such behavior. Mating of animals has one natural purpose to continue the species, if the purpose alters from that it would be unnatural, enough gays and the species is doomed, again end of the gays in that species with the removal of that species from the planet. Seems this is quite unnatural.
@ BWS, abomination Hebrew: towebah or toebah: something disgusting, an abhorrence.
Hebrew: pigguwl or piggul: to stink, unclean.
Hebrew: shaqats or sheqets: to loath, pollute, detest utterly, to be filthy.
Hebrew: baash: to be offensive, be abhorred, loathsome, stink utterly.
Hebrew: shiqquwts or shiqquts: disgusting, abominable filth, detestable.
I'm sure you want see this a meaning unnatural when applied to gay sex, but then that doesn't really mean it doesn't, for me it means unnatural as applied to gay sex.
Just to remind you, that you are wrong about gay sex in the NT.
Romans 1:26 ... For their women exchanged natural relations for those that are contrary to nature; 27) the men likewise gave up natural relations with women and were consumed with passion for one another, men committing shameless acts with men and receiving in themselves the due penalty for their error.
Here's why I would vote against gay marriage, Romans 1:32) "Though they know God's decree that those who practice such things deserve to die, they not only do them but give approval to those who practice them." To give approval would mean I'm guilty of the same and that means death, spiritual death, many Christians are in for a huge surprise and then disappointment. These verses are a confirmation of what I believed before I was a Christian.
Romans 2:14 "For when Gentiles, ie. all non Jews, who do not have the law,
by nature do what the law requires, they are a law to themselves, even though they do not have the law." This shows how those who have not heard about Christ will be judged, notice the bold in v. 14.

GC
PS to BWS: I ran across your Patheos site, now I know where all those comments come from, shame on you for copying another's work without giving them the credit.