Monotremes were the first mammals, then marsupials who carry their young in pouches then true mammals came last and overwhelmed the other two. Why Australia has most of the marsupials on Earth and the only two living members of the monotremes left in the world. Monotremes still lay eggs.
Monotremes were the first mammals, then marsupials who carry their young in pouches then true mammals came last and overwhelmed the other two. Why Australia has most of the marsupials on Earth and the only two living members of the monotremes left in the world. Monotremes still lay eggs.