Toads dig down into the ground as far as three feet. The hairs on a deer are hollow and filled with air to provide insulation from the cold. The soft fine hair next to their body acts like thermal underwear. The squirrel in search of food, keeps his tail flat against its back and neck to protect it. A sleeping Red Fox wraps its tail around its head like a muff.
Arctic foxes have the warmest fur of any animal in the world.
Snowshoe hares, grow fur up to an inch thick on the soles of their feet to provide warmth and skid-proof shoes. The snowshoe hare and several members of the weasel family acquire a white winter coat to make them invisible to predators against the snow. To escape from hawks and owls, Ruffed Grouse sometimes plunge head first into a snow bank and remain hidden for days. Mice and shrews spend their entire winter in an underground network of tunnels. These tunnels provide warmth, security, and a pathway to food sources.