Mammals:
* Polar Bear: Arguably the most famous for its thick fur, which is actually two layers: a dense undercoat and a longer, more oily outer layer.
* Arctic Fox: Has a thick, white fur coat in winter that turns grey or brown in the summer.
* Reindeer: Possesses a thick, double-layered coat that helps them survive harsh Arctic winters.
* Wolf: Known for its thick, grey fur that provides insulation and camouflage.
* Bearded Seal: Has a dense, thick fur coat for insulation in frigid Arctic waters.
* Yak: A large, long-haired ox adapted to high altitudes with thick, shaggy fur.
* Musk Ox: Renowned for its thick, woolly fur that is incredibly warm.
* Alpaca: Domesticated animals with thick, luxurious fleece that comes in various colors.
* Llama: Also domesticated, llamas have a thick, wool-like coat that is used for fiber.
* Snow Leopard: Possesses a thick, dense coat for camouflage and warmth in the high mountains.
* Arctic Hare: Has thick, white fur in winter for camouflage and warmth, and a brown coat in summer.
* Otter: Known for their thick, water-resistant fur that keeps them warm in cold waters.
* Seal: Many seal species have thick fur for insulation and water resistance.
* Beaver: Known for their thick, brown fur, which is used for insulation and waterproofing.
Other:
* Some bird species: Birds like the Ptarmigan and Snowy Owl have thick feathers for insulation in cold climates.
This list is not exhaustive, and there are many other animals with thick fur coats. The thickness of the coat can vary depending on the species, geographic location, and time of year.