The adult Norway rat has a body length of about 10 inches and a tail length of about 10 inches as well. They are light brown to grey in color. They are usually active at night and are good swimmers, both on the surface and underwater.
The deer mouse is small in size, only 3 to 4 inches long, not counting the length of the tail. They have large beady eyes and large ears.
House mice have an adult body length (nose to base of tail) of 3-4 inches and a tail length of 2-4 inches; their weight is typically less than one ounce. They vary from white to grey, light brown to black, with short hair and a light belly. The ears and tail have little hair.