A new documentary, “Second Nature: Gender & Sexuality in the Animal World,” challenges our long-held assumptions about how animals mate, bond, and behave. By shining a light on gender diversity and unexpected mating rituals, the film invites viewers to see the animal kingdom—and ourselves—with fresh eyes.

Stacker researched 31 celebrities who identify as nonbinary, genderqueer, or otherwise gender-nonconforming. These well-known figures expand the conversation on gender identity and underscore the importance of inclusivity in our culture.