When you spot a rodent scurrying across your property, knowing which type of rat you're dealing with makes all the difference. While all rat species might look similar at first glance, understanding their unique behaviors and habits is key to effective control.
Rat populations thrive across North America, but they're not all the same. The two most common types of house rats in the Western U.S. are the Norway rat and the roof rat. While both species share the typical rodent profile (pointed snouts, long tails, and rounded ears), they also have distinct characteristics, habitats, and behaviors that set them apart. Identifying which species has invaded your space helps us tailor the most effective rat control strategy for your property.
Norway rats and roof rats are opportunistic survivors that have adapted remarkably well to urban and suburban environments. They're drawn to the same things we are: shelter, food sources, and water. This is why they're so often found near human activity.
Despite the name, Norway rats aren't Norwegian at all; they're found pretty much everywhere. Also known as brown rats, sewer rats, or barn rats, they are large and stocky, and typically 7–9.5 inches long (body only), with coarse brown fur, a blunt nose, small ears, and a tail shorter than their body length.
Roof rats, or black rats, are aptly named. They're exceptional climbers who prefer life above ground. In the U.S., they're common in coastal and southern states, particularly near seaports. Both sleek and slender, they are typically 6–8 inches long (body only), with smooth dark brown to black fur, a pointed nose, large ears, and a tail longer than their body.
Rats are both a nuisance and a legitimate health hazard. According to the Centers for Disease Control and Prevention (CDC), rats are associated with the transmission of numerous diseases to humans, including leptospirosis, rat-bite fever, salmonellosis, and plague, which is spread by fleas carried on rats and remains a concern in parts of the Western U.S. These diseases are spread in lots of different ways, such as direct handling, bites, or contact with feces, urine, or saliva.
For commercial properties such as restaurants, food processing facilities, and warehouses, a rat infestation can lead to health code violations, failed inspections, and reputational damage.
If you’re dealing with a rat infestation of any size and you’re worried about the health risks, book a free inspection, and we’ll kick-start the rodent control process.
Early detection is crucial. The sooner you spot the signs of rats, the easier they are to control.
Look for these telltale indicators:
A few droppings in the garage don't necessarily mean a full infestation. But finding droppings in multiple rooms or seeing rub marks along baseboards usually indicates established pathways, meaning rats have been active for a while. The volume and spread of these signs tell us a lot about how far along the problem is, and help us determine the right level of response.
If you notice any of these common rat signs, it's time to take action.
Understanding where different types of rats prefer to live helps you target your prevention and control efforts.
Check out six important facts about rats to learn more about these common pests.
Prevention is always easier than elimination. From our experience in the field, some of the most common issues are dog food left out overnight in the garage, gaps where utility lines enter the building, particularly AC line sets and plumbing penetrations hidden behind shrubs, and a lack of regular exterior inspections, especially heading into fall when rats seek indoor shelter as temperatures drop. Here's how to make your property less inviting to rats:
Our rodent exclusion services help prevent rats in the first place.
While DIY methods might provide temporary relief, professional rat pest control provides a long-term solution.
Our approach includes:
Don't wait for a small problem to become a major infestation. Get in touch with us at 800-937-8398 or fill out our online form for expert rat control that protects your property and your health.
The Norway rat is the most common rat species in North America. It has largely displaced the black rat in urban environments due to its larger size, aggressive nature, and adaptability to various habitats.
Rats have sensitive noses and tend to avoid strong scents like peppermint oil, eucalyptus, and ammonia. However, while these smells might temporarily deter rats, they're not reliable long-term solutions. Professional exclusion and elimination methods are far more effective than relying on scent deterrents alone.
Norway rats are generally more aggressive than roof rats, particularly when defending territory or competing for food sources. Their larger size and ground-dwelling habits make them more likely to confront threats directly. However, any rat can become aggressive when cornered, threatened, or protecting young. If you encounter a rat, maintain distance and contact a professional rather than attempting to handle it yourself.
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