Flying squirrel is the gray squirrels' sneaky little cousin. Flying squirrels are nocturnal and about 1/3 the size of the grays. In Maryland, most often you will encounter the southern flying squirrel. They can enter your house through an opening the size of a quarter. You will usually become aware of their presence in the dead of winter. Flying squirrels will revisit the same nesting sites year after year. For removal, we use a special trap designed especially for flyers.