Actually, no, I was not referencing oxytocin, which only regulates desire, but the biochemistry AT BIRTH which will predetermine sexual orientation through the hypothalamus despite gender. Which proves the absolute right of men and women to be who they are.
This is an issue FOR HUMANS to which I am very much committed and have been since childhood because of association with family members, close friends, school mates, coworkers, colleagues, even lovers. So I do not spend time focused upon what occurs among animals, in zoos or elsewhere, and their homosexual or transsexual activities, much.
I spend my time focused upon what takes place on the streets, where my LGBTQ+ community friends are harassed and killed and in our State Legislatures here in the United States where laws are passed to promote that killing and harassment.
And, yes, as far as the birds are concerned, I DO think it unfortunate if they would pair off these days male and male, female and female, considering the damage we have done to them, killing them off, three billion every year. I would do EVERYTHING IN MY POWER to encourage them to mate, male and female. To procreate. Perhaps even so that someday they might survive us.