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Sexual dimorphism

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, color, markings, and may also include behavioral differences. These differences may be subtle or exaggerated, and may be subjected to sexual selection. The opposite of dimorphism is monomorphism.

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Male (left) and Female (right) House Sparrows. Very common in urban areas, like NYC.

Contributed by Johanna L Garcia

According to a recent study (Concluded in 2011) done at North Carolina State University, men, and women today look more like eachother than was the case with our ancestors. In particular, the faces of modern women appear to be noticeably larger, and overall shape differences are less pronounced in both sexes, now. Why this is not entirely known, and the findings of this study only add to a long list of similar questions, but the researchers say it may have to do with environmental, or nutritional factors.

Contributed by Sean Gay

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