Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Male pregnancy refers to the incubation of one or more embryos or fetuses by the male of any species. All pregnancies in the animal kingdom, besides seahorses, whose males carry the young until birth, are carried by female organisms. In all heterogamous species, the males produce the spermatozoa and rarely, if ever, host the zygote (the pipefish and seahorse are notable exceptions).
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