Fish, if the oxygen is cut off because the lake is too shallow will die. Many turtles burrow in the mud at the bottom of the pond or lake. In the fall, baby painted turtles hatch in their underground nests and freeze along with the sandy surroundings. In the spring they thaw out, dig to the surface, and crawl away. Birds and animals will starve if too much snow or ice covers the food.
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.