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Rats
About 6-8 inches long at maturity
Blunt head
Ears proportional to the size of their heads
Droppings around ½ inch long
Thicker (sometimes hairless) tails
Mice
Generally about 2-4 inches in length from nose to end of tail at maturity
Triangular head, pointed muzzles
Disproportionally large ears
Droppings range in length from 1/8 to 1/4 inch long (resembles rice)
Thin tails
Opossum
About 2.5 feet long (nose to end of tail) at maturity
9-13 lbs (size of a house cat)
Pointed muzzle, pink noses, and sharp teeth
Hairless tails