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Secondary sex characteristics are features that appear during puberty in humans and sexual maturity in other animals, especially those that distinguish the two sexes of a species, but that are not directly part of the reproductive system, as the primary sex characteristics are. They are believed to be the product of sexual selection for traits which give an individual an advantage over its rivals in courtship and aggressive interactions. They are distinguished from the primary sex characteristics — the sex organs — which are directly necessary for reproduction to occur.

Well-known secondary sex characteristics include manes of male lions and long feathers of male peacocks. Other dramatic examples include the tusks of male narwhals, enlarged proboscises in male elephant seals and proboscis monkeys, the bright facial and rump coloration of male mandrills, and horns in many goats and antelopes. Male birds and fish of many species have brighter coloration or other external ornaments. Differences in size between sexes are also considered secondary sexual characteristics.

In humans, visible secondary sex characteristics include enlarged breasts of females and facial hair and adam's apple on males.


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