Yes. Lots of them.

Google it ffs

Yes it is common in the animal kingdom. Primates exhibit sexual behavior between same gender. It is nature's way.

Yes, just a couple of days ago there was an item on a wildlife programme on TV where a pair of homosexual penguins stole an egg from a penguin couple and a fight ensued. It was fascinating. I believe there is other evidence of other species engaging in homosexual behaviour.

Acts of homosexuality absolutely. Certain animals, some insects and other lower species have males that will act as females to get treats.

We had two love birds. I forget their real names, as we called them blood and vicious. Love birds will pick a single mate to stay loyal to. Those two, both females, bonded. If we had introduced a male into their cage they would have literally taken his head off. Love birds are not nice and lovey to others, only to one other love bird.