Originally Posted by
flyinbob
As far as I know, nature divided the human species into only 2 categories. Male or female. Is there a new member of the species?

Not much of a medical science background?
Nature also creates people that are intersex at birth -- even on the chromosomal level but not limited to that.
http://www.nlm.nih.gov/medlineplus/e...cle/001669.htm
NIH is part of the USG.