How do squirrels keep warm in the winter?

"The fox squirrel and gray squirrel bury nuts and acorns in the ground near their den trees. In winter these are dug up and eaten, even through inches of snow. http://www.newton.dep.anl.gov/natbltn/60... "DO SQUIRRELS MIGRATE OR HIBERNATE IN THE WINTER? Although squirrels seem to disappear from sight in the winter months, they are in the exact places where they lived during the warmer months. In fact, squirrels spend their entire lives within only three to five acres. Ground squirrels hibernate during the winter months, but tree squirrels do not. Tree squirrels keep warm by snuggling with their family in their tree nests or ground burrows. As soon as the weather permits, they emerge and begin hunting for food again. Squirrels are very sensitive to weather changes and prepare for an upcoming drop in temperature by instinctively burying their nuts underground as well as binge eating!" http://www.geocities.com/Heartland/Lane/... Red squirrel - "Active during the day, they spend the warmer months preparing for winter by finding and hiding food. They do not hibernate, but if the weather is very cold, a squirrel will stay in his nest until it is warmer. A red squirrel usually has several nests in tree hollows or underground tunnels, and any number of food caches. Each cache might hold two hundred pine cones. Using their keen sense of smell, red squirrels can easily locate stored food even under a meter (3 ft) of snow!" http://www.switcheroozoo.com/profiles/re... "Winter: The grey squirrel does not hibernate and it cannot store enough energy to survive for long periods without food. A larger, thicker winter drey is built, usually on a strong branch close to the trunk, and a squirrel will lie up in this in very cold weather, coming out now and then to search out hidden stores of food. These stores of single nuts and other items are buried in the ground in autumn, well spread out. They are found by smell, rather than memory. Often they are not found at all and later may grow, helping the dispersal of trees. Winter dreys are often shared for warmth. As it sleeps, the squirrel curls its tail around its body to act as a blanket." I got this from Yahoo! User.