High Quality Content by WIKIPEDIA articles! Male pregnancy refers to the incubation of one or more embryos or fetuses by male members of any species. In nearly all heterogamous animal species, offspring are ordinarily carried by the female until birth, but in fish of the Syngnathidae family (pipefish and seahorses), males perform this function. By some definitions of male identity, human men have done so in certain instances, and male humans incubating fetuses are a recurring theme in speculative fiction.