Other kinds of intersex conditions are identified immediately at birth because those with the condition have a sexual organ larger than a clitoris and smaller than a penis.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.Most hermaphroditic species exhibit some degree of self-fertilization.
For example, the great majority of tunicates, pulmonate snails, opisthobranch snails and slugs are hermaphrodites.
Hermaphroditism is also found in some fish species and to a lesser degree in other vertebrates. Historically, the term hermaphrodite has also been used to describe ambiguous genitalia and gonadal mosaicism in individuals of gonochoristic species, especially human beings.
Hermaphrodite is used in older literature to describe any person whose physical characteristics do not neatly fit male or female classifications, but the term has been replaced by intersex.
Intersex describes a wide variety of combinations of what are considered male and female biology.
The word intersex has come into preferred usage for humans, since the word hermaphrodite is considered to be misleading and stigmatizing, Since the estimated total number of animal species is 8.6 million, the percentage of animal species that are hermaphroditic is about 0.7%.