性的二型 性的二形
Sexual dimorphism is the systemic difference in form between individuals of different sex in the same species.

Use this tag when the post showcases the distinctions between sexes of a given non-human species (i.e. both sexes are present and differences are easily discernible). Example posts: post #989657 post #876492. It is insufficient for an individual with gender-specific traits to be present.
sexual dimorphism