Here's a breakdown of why:
* Adaptation to the Ice Age: Woolly mammoths evolved during the Pleistocene Epoch, also known as the Ice Age. This period was characterized by glaciers, frigid temperatures, and harsh winters.
* Insulation: Their thick fur acted as a natural insulator, trapping a layer of warm air close to their bodies. This helped them maintain their body temperature in extremely cold conditions.
* Two Layers of Fur: Woolly mammoths had two distinct layers of fur. The outer layer was made of long, coarse guard hairs that provided protection from the elements. The undercoat was made of shorter, denser fur that provided insulation.
* Subcutaneous Fat: In addition to their thick fur, woolly mammoths also had a layer of subcutaneous fat, which further helped to insulate their bodies.
So, their thick hair was a crucial adaptation that allowed them to thrive in the icy landscapes they called home.