| Known as |
Marsupials |
Placental mammals |
| Reproduction |
Live birth and offspring continue development in a pouch. |
Live birth and offspring fully develop inside the uterus and get nutrition through placenta. |
| Gestation period |
Short gestation period usually of few weeks |
Longer gestation period |
| Placenta |
Simple, short-lived placenta or absent |
Well-developed, complex placenta |
| Geographic distribution |
Predominantly in Australia and the Americas |
Widespread globally |
| Number of Species |
Diverse group with a significant number of species |
Largest group of mammals with the highest number of species |
| Lifespan |
Shorter lifespan |
Longer lifespan |
| Examples
|
· Kangaroos
· Koalas
· Opossums
|
· Humans
· Dogs
· Cats
· Elephants |
