Write the important characteristics of group Mammalia.

Characteristics of Mammalia:

1. Mammals are characterized by the presence of hair on the body.
2. All mammals have external ears or pinna. They nourish their young ones with the milk secreted by mammary glands.
3. They are warm-blooded animals.
4. They breathe through the lungs and move with the help of limbs.
5. They give birth to their live young ones, i.e. they are viviparous.
6. Man, monkey, goat, lion, tiger, whale, and bat belong to this group.