Timberoo saidThere are more than two genders?
Technically, yes. There is a gender called "Intersex", the so-called 'false' hermaphrodites. They exhibit the external genitalia of both sexes due to genetic defects or hormonal imbalances, but only one of them is functional.
There are also hermaphrodites (in which both external genitalia are present AND fertile), they exist among animals, but I don't really know if they really exist in humans at all. They are further subdivided into hermaphrodites which can self-fertilize, hermaphrodites that are hermaphrodites all their life, hermaphrodites that change sex as they mature (like limpets), etc.
Not to mention the species which do not exhibit the dual gender system of higher animals (bacteria) or species which once had a dual system but now mostly rely on parthenogenesis - essentially cloning themselves (probably because of the extinction of one gender among their populations).