Color The brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, Hanover rat, Norway rat, Norwegian rat, Parisian rat or wharf rat, is one of the best known and most common rats.. One of the largest muroids, it is a brown or grey rodent with a head and body length of up to 28 cm (11 in) long, and a tail slightly shorter than that. Both brown rats and black rats have been known to carry potentially deadly diseases. Droppings. Also called the black rat, ship rat or old English rat, the Roof Rat measures 6-8 inches long and has a tail that's slightly longer than its body. Swimming: Roof Rats are excellent climbers while Norway rats are excellent swimmers. Average Size of Norway Rats vs Roof Rats. Signs of a Norway Rat Infestation . Even a small rat infestation can produce literally thousands of droppings in a short period of time. How to Identify and Eliminate Roof Rats » ... Signs of Norway Rat Damage. When the aggressive Norway rat and the roof rat compete for the same areas, the Norway rat frequently becomes dominant, and the roof rat soon disappears. Norway rat (Rattus norvegicus), also called brown rat. Average Size of Norway Rats vs Roof Rats. Can “Roof Rats” help me out? Just like everything else, location is everything when it comes to identifying a Roof rat from a Norway rat. Norway rats are burrowing rats that love to shred any available materials for their nests. But a guessing game of rat vs. squirrel could keep you from discovering entry points and steer you […] Rat-bite fever is, unsurprisingly, transmitted by rats. Norway Rats can be as long as 18 inches from tail to nose, and can weigh up to 1 pound. The Norway Rat droppings are 1/4 to 1/2 inch in length. The Norway Rat (aka: Brown, Sewer, Common, House, or Wharf Rat) is one of the largest rodents to infest houses in Western Washington. Norway rats are cousins to roof rats, but they are larger. How Do Norway Rats Get in the Attic? They are easily identified by their roundish bodies, small ears, snub muzzle, and a broad tail that is no longer than its body. Droppings, gnaw marks, and urine odors are just a few signs of rat activity. "The present distribution of the Norway and roof rats appears related to two factors, competition between the two species and the reaction of both to different climates. Although it may be difficult to successfully identify a rat without the proper training, there’s a general consensus when comparing Norway rats and Roof rats: Norway rats are darker, larger, and heavier than roof rats. The brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, Hanover rat, Norway rat, Norwegian rat, Parisian rat or wharf rat, is one of the best known and most common rats.. One of the largest muroids, it is a brown or grey rodent with a head and body length of up to 28 cm (11 in) long, and a tail slightly shorter than that. Norway Rats in the U.S. Despite their international-sounding name, Norway rats are extremely common throughout the United States. Contact with either species of rat can also leave you with leptospirosis, Lymphocytic choriomeningitis, Hantavirus Pulmonary Syndrome, Salmonellosis, and the bubonic plague. Roof rats are very agile climbers and usually live and nest above ground in shrubs, trees, and dense vegetation such as ivy. Gnaw marks throughout the house are one clue of the presence of Norway rats. Norway Rats will leave a mark as they drag their tails between their feet. Climbing vs. Facts About Rats - Roof Rat or Black Rat. Are mixed infestations of two species common? Distinguishing Norway Rats from Roof Rats. Norway Rat Habits Vs Roof Rat Habits. While the roof rat may be more common in the top floors of buildings, it's also possible to see Norway rats in attic spaces. Roof rat (Rattus rattus), also called black rat, ship rat. Roof Rats will be more commonly found in your attic while Norway Rats on the ground level. I hate food rats, they’re so much harder to trap than Norway rats. Medium-sized chunky rodent with a scaly tail that is shorter than the body. Scrabbling on the roof and scurrying in the attic – is it rats, or is it squirrels? Droppings are the most commonly encountered evidence of rodent activity. The droppings are capsule shaped and have blunt ends. People refer to rats by many names -- brown rat vs. black rat, for example -- without realizing that many describe the same two species.