Norway rat~ Also Known as Wharf, Sewer, brown, common)
TAIL~ Shorter than head & body
BODY~ Heavy & Thick
HABITS~ USUALLY NESTS IN BASEMENTS & LOWER PORTIONS OF BUILDINGS. BURROWS IN SOIL EXTENSIVELY, ACTIVE PRIMARILY AT NIGHT, FAIR CLIMBER & GOOD SWIMMERS.
roof rat~ also known as black, fruit, ship)
TAIL~ Longer than head & body
HABITS~ usually enters & nests in upper portions of buildings. may nest outside in trees, ivy, etc...burrows very little. excellent climber & active at night.
HABITS~ may nest in any portion of a building near food. has an average range of 50 ft. from their nest. active mostly at night. nibbles on small amounts of food frequently, rather than having large meals.