 Polyploid mole salamanders (mostly triploids) are all female and reproduce by kleptogenesis, "stealing" spermatophores from diploid males of related species to trigger egg development but not incorporating the males' DNA into the offspring.While mammalian liver cells are polyploid, rare instances of polyploid mammals are known, but most often result in prenatal death.An octodontid rodent of Argentina's harsh desert regions, known as the plains viscacha rat ("Tympanoctomys barrerae") has been reported as an exception to this 'rule'.