The Mount Graham squirrel is tiny, weighing a mere 8 ounces (224 grams) and measuring about 8 inches in length, with a 6-inch long fluffy tail. Unlike many other squirrels, the Mount Graham species does not have a white-fringed tail. Females and males look much alike; they are grayish brown in color and have rusty and yellowish markings along their backs. Their underfur is white, with a dark line running through it during the summer.