page_title: Sexual dimorphism
section_title: Overview
hierarchical_section_title: Sexual dimorphism / Overview
caption_attribution_description: Photo by David Stang.
context_page_description: Sexual dimorphism is the condition where the two sexes of the same species exhibit different characteristics beyond the differences in their sexual organs. The condition occurs in many animals and some plants. Differences may include secondary sex characteristics, size, weight, colour, markings, and may also include behavioral and cognitive differences. These differences may be subtle or exaggerated, and may be subjected to sexual selection and natural selection. The opposite of dimorphism is monomorphism.
caption: Male (bottom) and female mallards. The male mallard has an unmistakable bottle green head when its breeding plumage is present.
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