The calls come in all winter, said Paul DeBow of DeBow Wildlife Service in Plymouth, N.H. If there is no snow, the peak will be in January or February, when it’s the coldest. Some people think the animals they hear partying in the attic are chipmunks, he says. Chipmunks in the attic in the middle of winter. But they are not.
Chipmunks, DeBow explained, hibernate in winter and what homeowners are probably hearing are flying squirrels. Because flying squirrels are nocturnal, few people ever see them.