Adults measure about 16 inches in total length from nose to the end of tail. Total head & body length is 6-8 inches (16-20 cm); tail length is 7-10 inches (19-25 cm); weight is about 5-9 ounces. Norway Rat (Brown Rat, House Rat, Wharf Rat, Sewer Rat) is large, has a blunt muzzle, small eyes, small ears that are hairy, a tail that is shorter than head and body length, and is 2-colored; rod shaped droppings with blunt ends.
Hispid Cotton Rat has tail length about half of head and body, coarse fur that is grayish on top and mixed buff, whitish and black on underside. House Mouse is small, short, with tail about same length as head and body; droppings 1/8-1/4 inch (3-6 mm) long, rod shaped with pointed ends. Most native rats and mice have hairy tails; or if tails are almost naked, they appear to be ring-like segments.
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