Do any species have more than two sexes?
The vast majority of sexually reproducing species have two genders: males, which produce tiny gametes (sperm or pollen) containing only genetic material; and females, which produce large ones (eggs or ovules) that are also stocked with provisions for the developing offspring. These rules are flagrantly disregarded by fungi, however. Some species are not differentiated into males and females at all, and can exchange genetic material with any other individual. Others have two ‘mating strains’ (roughly equivalent to sexes) and some have many strains, only some combinations of which are reproductively compatible. A rare exception among animals is the harvester ant Pogonomyrmexx spp., which has two types of male. The sperm of one strain makes queens and the sperm of the other type makes workers.
Harvester ant girls will be boys.