The eastern gray squirrel has predominantly gray fur, but it can have a brownish/black color. They range between 15-20 inches in length (nose to tail), and the adult weight varies between 14 and 21 ounces.Eastern gray squirrels can breed twice a year, but younger and less experienced mothers normally have a single litter per year in the spring. Normally, one to four young are born in each litter, but the largest possible litter size is eight.