sciatrix

I have a question, and you might be a person who can actually answer it. I've heard of gay animals, intersex animals, etc. I was working on a manuscript about antlers and it occurred to me that I don't know if anyone's researched trans animals. There's social behaviour in animals that's tied to gender but not specifically to genitals. I think of the elephant, where adult females herd and adult males live alone. Sure, you could make arguments about biological necessity, but those same arguments would hold for gay animals (well, maybe not for the lesbian penguins, but certainly for the gay necrophilic duck!) Is there any research on that?