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The SRY is then activated in only certain areas, causing development of testes in some areas by beginning a series of events starting with the upregulation of SOX9, and in other areas not being active (causing the growth of ovarian tissues).

Thus, testicular and ovarian tissues will both be present in the same individual.

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.

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.

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.

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.

Arthropods are the phylum with the largest number of species.

Most hermaphroditic species exhibit some degree of self-fertilization.

Clinically, medicine currently describes intersex people as having disorders of sex development, a term vigorously contested.

have criticized medical interventions designed to make intersex bodies more typically male or female.