While some mammals have very short or sparse hair, and others have lost it entirely in specific areas or even all over their bodies (like whales and dolphins), all mammals have hair at some stage of their life.
Here's why hair is so important for mammals:
* Insulation: Hair traps a layer of air next to the skin, providing insulation against cold temperatures.
* Protection: Hair can protect mammals from injuries, abrasion, and even parasites.
* Camouflage: Some mammals have patterns or colors in their hair that help them blend in with their surroundings.
* Sensory: Whiskers are specialized hairs that act as sensory organs, helping mammals navigate and detect prey.
* Communication: Hair can be used in social displays, such as when animals bristle their fur to show aggression or fear.
While hair is the primary body covering, some mammals may also have other coverings like scales (like armadillos) or feathers (like the platypus).