English Across the Curriculum
The World of Mammals
Types of Mammals
Mammals are divided into three groups:
- Monotremes are mammals that lay eggs, like a bird. They live in Australia and New Zealand. The platypus belongs to this group.
- Marsupials are mammals that raise their young ones in a pouch in their bodies.
- Placentals are the largest group of mammals. The babies grow inside their mothers until they are ready to be born. Humans are placentals.
