"The baby ducks were imprinted by the chicken and were being raised as chickens but they still knew they were ducks."
That's a great story and a perfect example of how you can't fool Mother Nature. I'm a chicken farmer myself and I have yet to notice any of my hens "doin' it" or even attempting to "do it" with one another. They know what the rooster is for, and some readily submit and some fight him off, but they still know they need him for something, LOL!
One thing they try to use as an argument is that animals try to have same-sex sex all the time. I've never seen this. I have seen cows try to mount cows and the same with dogs but anybody that knows animals know that it's a way of showing and establishing dominance and the "pecking order". It's not really about sex. Homosexuals are desperately trying to justify their perverted behavior.