Squirrels are mischievous and smart. Starting in the fall and through the winter, squirrels will start to get fat. Squirrels do not hibernate in the winter, so they may be seen at all times in the winter. However in winter they are less active, sleeping for long periods, sometimes several days at a time. At my Grandma and Grandpa’s house, they have a squirrel, who is always trying to get to their suet feeder. The squirrel, of course finds a way to get up to the suet feeder.