Viviparous reproduction involves the fertilized egg (or zygote) being retained within the uterus of the female, where it is nourished by nutrients and gases (especially oxygen) passing from the mother across a specialized, blood-rich tissue known as...

A viviparous animal 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. The less developed form of vivipary is called ovoviviparity, which, for...