Mammals:
* Arctic Fox: Turns from brown in the summer to white in the winter for camouflage in the snow.
* Snowshoe Hare: Changes from brown to white, allowing it to blend into the snowy landscape.
* Ermine: Also turns from brown to white in winter, except for the black tip of its tail.
* Wolverine: Grows a thicker, darker coat in winter for insulation in cold climates.
* Red Fox: Their coat gets thicker and denser in winter for warmth.
* Squirrels: Their fur becomes thicker and fluffier in winter.
* Deer: Many species grow a thicker winter coat for warmth, which is shed in the spring.
* Bears: Grow a thick, shaggy coat in winter for insulation and shed it in the spring.
* Weasels: Like ermines, they turn white in the winter for camouflage.
* Mountain Goats: Their fur becomes thicker and denser in winter, providing extra insulation.
* Arctic Hare: Similar to the Snowshoe Hare, it turns white in winter.
Other Animals:
* Ptarmigan: This bird changes its feathers from brown in the summer to white in the winter.
* Sable: This weasel-like mammal has a rich brown coat in the summer and a dark, almost black coat in the winter.
Note: The exact color and density changes can vary depending on the species, geographic location, and individual animal.