Oviparous species produced undeveloped eggs that hatched outside the maternal body, rather than live young. Most reptiles were oviparous. Example of non reptilian species that used that reproductive mode included mollusks like the swamp slugs, reptavians like the peko-peko, avians like the Pylat birds, and amphibians like the Shawda Ubb. Although untypical, some mammals, like the S'kytri, were oviparous.