Page "Uterus" Paragraph 1

Most animals that lay eggs, such as birds and reptiles, including most ovoviviparous species, have an oviduct instead of a uterus.

Note however, that recent research into the biology of the viviparous ( not merely ovoviviparous ) skink Trachylepis ivensi has revealed development of a very close analogue to eutherian mammalian placental development.