Humans stand under the placental mammal category. The have all the attributes of being a placental mammal.
Placental mammals are a diverse group, with nearly 4000 described species, mostly rodents and bats. The placental mammals include animals such as elephant, whales, rodents, and more.
Marsupials are a type of mammals that have a pouch for their babies. The pouches have a place where the baby could be fed without leaving it.
Monotremes are mammals that lay eggs. There are 5 living species alive now. The platypus and 4 types of echidna are the 5 species