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The apparent penis in female spotted hyenas is in fact an enlarged clitoris, which contains an external birth canal.It can be difficult to determine the sex of wild spotted hyenas until sexual maturity, when they may become pregnant.When spotted hyenas were first discovered by explorers, they were thought to be hermaphrodites.Early observations of spotted hyenas in the wild led researchers to believe that all spotted hyenas, male and female, were born with what appeared to be a penis.Intersex is in some caused by unusual sex hormones; the unusual hormones may be caused by an atypical set of sex chromosomes.One possible pathophysiologic explanation of intersex in humans is a parthenogenetic division of a haploid ovum into two haploid ova.Upon fertilization of the two ova by two sperm cells (one carrying an X and the other carrying a Y chromosome), the two fertilized ova are then fused together resulting in a person having dual genitalial, gonadal (ovotestes) and genetic sex.Another common cause of being intersex is the crossing over of the SRY from the Y chromosome to the X chromosome during meiosis.

For example, the great majority of tunicates, pulmonate snails, opisthobranch snails and slugs are hermaphrodites.Intersex describes a wide variety of combinations of what are considered male and female biology.Intersex biology may include, for example, ambiguous-looking external genitalia, karyotypes that include mixed XX and XY chromosome pairs (46XX/46XY, 46XX/47XXY or 45X/XY mosaic).Some humans were historically termed true hermaphrodites if their gonadal tissue contained both testicular and ovarian tissue, or pseudohermaphrodites if their external appearance (phenotype) differed from sex expected from internal gonads.

This language has fallen out of favor due to misconceptions and pejorative connotations associated with the terms, and also a shift to nomenclature based on genetics.

Some people who are intersex, such as some of those with androgen insensitivity syndrome, outwardly appear completely female or male, frequently without realizing they are intersex.

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