what are marsupials
Marsupials (Marsupialia) are a group of mammals that like most other groups of mammals bear live young when the embryos are in an early stage of development.y Laura Klappenbach. Marsupials (Marsupialia) are a group of mammals that like most other groups of mammals bear live young when the embryos are in an early stage of development. In some species such as the bandicoot, the gestation period is as short as 12 days.