Poa alpina, a grass which shows vivipary: the seeds germinate while still attached to the mother plant. Grass is the common word that generally describes Monocotyledonous green Plants The family Gramineae ( Poaceae) are the "true grasses" and include

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). In most Birds and Reptiles an egg ( Latin ovum) is the Zygote, resulting from Fertilization of the Ovum. Oviparous animals are animals that lay eggs, with little or no other Embryonic development within the mother The mother then gives live birth. A live birth occurs when a Fetus, whatever its Gestational age, exits the Maternal body and subsequently shows any sign of life such as voluntary The less developed form of vivipary is called ovoviviparity, which, for instance, occurs in most vipers. Ovoviviparous Animals develop within eggs that remain within the mother's body up until they hatch or are about to hatch The Viperidae are a family of Venomous snakes commonly referred to as vipers, although the term viperids is more specific and distinguishes them from The more developed form of vivipary is called placental viviparity; mammals are the best example, but it has also evolved independently in other animals, such as in scorpions, some sharks, some snakes, and in velvet worms. The placenta is an Ephemeral organ present in placental Vertebrates, such as Eutherial Mammals and Sharks during Gestation Scorpions are eight-legged Carnivorous Arthropods They are members of the order Scorpiones within the class Arachnida. Sharks ( Superorder Selachimorpha) are a type of Fish with a full cartilaginous Skeleton and a highly streamlined body A snake is an elongate Reptile of the suborder Serpentes Like all reptiles snakes are covered in scales. The velvet worms ( Onychophora — literally "claw bearers" form a Clade within the Ecdysozoa and can be simply described as " Worms Viviparous offspring live independently and require an external food supply from birth. Certain lizards also employ this method such as the genera Tiliqua and Corucia. The placenta is attached directly to the mother in these lizards which is called viviparous matrotrophy. There are numerous advantages and disadvantages to being viviparous.

See also

• Oviparity
• Ovoviviparity
• Placental mammals
• Marsupials
• Live-bearing aquarium fish
• False vivipary