 Australian marsupial juvenile males have a greater tendency to disperse from their natal groups, while the females remain philopatric.In "Antechinus" this is due to the fact that males die immediately after mating; therefore when they disperse to mate, they often meet with female natal groups with zero males present.Furthermore, the Oedipus hypothesis also states that fathers in polygynous systems will evict sons with the potential to cuckold them.