“What parent wouldn’t?”
I wouldn’t “fully support” my kids if they announced they were gay. Not unless you count telling them they need to repent and turn to God as fully supporting them. I got my degree in Biology. I keep thinking about mammals, and find the idea of a male mammal sticking its penis into another male’s butt as “weird”. Even apart from what the Bible says God thinks of it.
I think that Konrad Lorenz, the ‘father of ethology’, stated that other than man, there are no homosexual animals.
However, there are animals which exhibit bisexual behavior when something has gone wrong in their social order or development.
Some animals other than man DO, sometimes, try to mate with others of their own sex.