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The argument that animals involve themselves in homosexual behaviour is pretty weak imo. Some animals are incest, that doesn't mean incest is natural or morally correct.
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Incest isn't natural in the animal kingdom and is extremely uncommon unlike homosexuality.
The only cases you will see nowadays (and limited to very few species) is if out-breeding is impossible but still a lot of species treat incest like it is wrong and they can tell when it occurs.
Animals have adapted and evolved to avoid incest while homosexuality behaviour grows so even the animal kingdom can tell incest is wrong and homosexuality isn't.
Also, incest is strictly for reproduction and the only time it's ever done in the animal kingdom (and most species do not support their own kind who participate in it) so the incest counter-argument holds no ground.
Homosexuality occurs outside of sexual pleasure as I listed above here are just a few reasons why they may also participate in it: affection, pair bonding, parenting. Homosexuality extends beyond just pleasure in both the animal kingdom and in human nature so yes that is a good indicator to me it is natural and should be accepted.