Pygmy Nuthatches snuggle tightly to keep warm during a sub-zero storm. The Chickadee and Tufted Titmouse fluff their outer contour feathers, trapping insulating layers of air between the soft down feathers near their body. Bobwhites roost in a circle to fight off the winter chill. Moths and butterflies pupate into a state of dormancy wrapped in their silk cocoon. 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.