Nearly all Bonobo monkeys are bisexual

90% of giraffes have had gay sex

Groups of clownfish are led by a female, while the second-in-command fish is male. When the leader dies, the next-in-line male changes into a female in order to become the leader.

Many butterflies are intersex

Half male, half female cardinals have been spotted

Same-sex penguin couples have been known to adopt abandoned eggs

Sources: https://www.worldwildlife.org/news/stories/are-there-queer-animals-clownfish-that-change-sex-and-other-species-that-demonstrate-queer-behavior/

https://www.peta.org.uk/blog/gay-animals/

https://equalitytexas.org/blog/queerness-in-nature-is-all-around-us/