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Monotremes- are mammals that lay eggs instead of giving birth to live young like marsupials and placental mammals

Oviparous- animals are animals that lay eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians and reptiles, all birds, the monotremes, and most insects and arachnids.

Ovoviviparous- animals develop within eggs that remain within the mother's body up until they hatch or are about to hatch. This strategy of birth is known as ovoviviparity. It is similar to vivipary in that the embryo develops within the mother's body. Unlike the embryos of viviparous species, ovoviviparous embryos are nourished by the egg yolk rather than by the mother's body. However, the mother's body does provide gas exchange.

Viviparous- is an animal employing vivipary: the embryo develops inside the body of the mother, as opposed to outside in an egg (ovipary). The mother then gives live birth.

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