Mammals are typically viviparous, meaning they give birth to live young. However, there is a small group of mammals called monotremes that are oviparous, meaning they lay eggs. The two types of monotremes that exist today are the platypus and the echidnas (also known as spiny anteaters). - Talpa (Moles) are placental mammals (viviparous). - Echidna is a monotreme mammal that lays eggs. - Pteropus (Flying Fox) is a bat, which is a placental mammal (viviparous). - Lemur is a primate, which is a placental mammal (viviparous).