Here's why:
* Insulation: Dense fur acts as excellent insulation, trapping a layer of warm air close to the animal's body. This helps them stay warm in frigid temperatures.
* Adaptation: Animals living in cold environments evolve to have thicker coats of fur to survive the harsh winters.
* Examples: Animals like polar bears, arctic foxes, and seals all have extremely dense fur to survive the extreme cold of the Arctic.
However, there are some exceptions:
* Other factors: The type of fur (underfur, guard hairs, etc.) and the overall size and shape of the animal also play a role in heat regulation.
* Tropical climates: Some animals in tropical climates may have dense fur for other reasons, like camouflage or protection from insects.
So, while a dense coat of fur is a good indicator of a cold climate, it's not the only factor to consider.