sexual dimorphism

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: Danbooru post #989657 Danbooru post #876492. It is insufficient for an individual with gender-specific traits to be present.