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When you hear a strange scratching sound in the walls or find mysterious droppings in your pantry, it’s easy to jump to one conclusion: rodents. But identifying the specific type of rodent is the first and most critical step toward effective removal. The three most common species found in homes are the house mouse, the Norway rat, and the roof rat. Each has adapted to thrive alongside humans, but their differences are significant. While all rodents share common features like a single pair of upper incisors, short legs, and long tails, a closer look reveals distinct characteristics. Knowing whether you have a mouse vs. a rat can determine the best course of action, as their behaviors, nesting habits, and even diet vary greatly. This guide will help you spot the difference and understand why correct identification is key to protecting your home and health.
At first glance, a small rat might look like a large mouse. However, there are several physical traits you can use to distinguish between these pests.
The house mouse is the smallest of the three, typically measuring only 4 to 6 inches long, including its tail. They are often confused with young rats due to their size. Their fur is usually light grey or brown, with a lighter, often white, belly. A house mouse has a small head with a triangular snout, long whiskers, and large, floppy ears. Their tail is thin and hairy, and notably longer in proportion to their head and body.
Also known as the brown rat, the Norway rat is the largest of these rodents, growing up to 10 inches long. They have thick, heavy bodies covered in shaggy brown fur with black shading. Their underside is typically a paler color. A key identifier is their tail, which is shorter than the length of their head and body, and appears thick, hairless, and scaly. They have a blunt nose and small, hairy ears.
The roof rat, also called the black rat, has a more slender body than the Norway rat and is usually about 8 inches long. Their fur is smooth and typically gray with black shading. Like the house mouse, their dark, scaly tail is longer than their head and body. They can be distinguished from mice by their large, thin, hairless ears and pointed noses.
What these pests eat and how they eat it can leave behind important clues.
Where you find evidence of rodents can tell you a lot about the species you’re dealing with.
House mice are agile climbers and live on the ground, often nesting in burrows or hidden areas near a food source. They will build nests out of any soft material they can find, such as shredded paper, insulation, or fabric. One telltale sign of a mouse infestation is the presence of “urine pillars,” which are small mounds of grease, dirt, and urine that build up over time.
As their larger size suggests, Norway rats prefer to stay on the ground. They are known for creating extensive burrows, which can cause significant damage to sewer lines and building foundations. They often travel along the same paths, leaving behind smudges from the oil and dirt on their fur. You’ll typically find them in basements, crawlspaces, and sewer systems.
True to their name, roof rats are exceptional climbers and prefer to nest in elevated areas. You can find them in attics, under roofs, and within walls. In warmer climates, they may even build nests in trees. Unlike Norway rats, they tend to walk on their toes, leaving scattered, less distinct smudge marks along their paths.
Understanding the breeding habits of rodents highlights why a small problem can quickly become a large infestation. The newborns of all three species are born blind, hairless, and entirely dependent on their mother.
Rodents have distinct personalities and behaviors that influence how they interact with their environment.
One of the most common signs of a rodent infestation is their droppings. The size and shape are key identifiers.
Regardless of whether you have mice or rats, any rodent infestation poses serious risks. Their droppings can spread diseases like Hantavirus and salmonellosis. Furthermore, their constant gnawing can cause structural damage to your home and create fire hazards by chewing through electrical wires.
If you suspect a rodent problem, it is essential to act quickly. A licensed pest control professional can accurately identify the species, implement safe and effective removal techniques, and create a comprehensive prevention plan to keep your home rodent-free. Contact a rodent control professional today to ensure the health and safety of your home and family.
Signs of a rodent infestation are pretty easy to spot – droppings in the house, chew marks, gnawed wood, and scratching and squealing sounds at night are all pretty good indicators of a rodent problem. Before deciding on a course of treatment, however, the first step is determining which type of rodent you have. So how do you know if you have a rat or a mouse?

Mice are small rodents, usually about 2 to 4″ in length, with thin, long, slightly hairy tails. They have triangular shaped noses with long whiskers and large floppy ears. Mice can be brown, gray, or white in color. Mice droppings are small and smooth with pointed ends, usually about 1/8 to 1/4″ in length. They leave anywhere from 40 to 100 droppings per day. Mice prefer cereal grains or plants but will eat almost anything. They are nocturnal and tend to be bolder than rats. They are curious and will explore new things, making them easier to trap. They are skillful climbers and their small size allows them to access more areas of your home.

Norway rats are larger rodents, usually weighing about 11 ounces and measuring 7 to 9 inches in length. They have heavy, thick bodies that are brown in color with black shading and shaggy coats. Norway rats have blunt, rounded noses and short ears. Their tails are thick, hairless, and scaly and are dark colored on top and pale underneath. Norway rat droppings are brown and blunt on both ends and they leave anywhere from 20 to 50 droppings per day. They prefer fresh grains and meat but will eat just about anything. These rats typically live in burrows and prefer lower levels of homes and buildings. Norway rats are nocturnal and are more fearful and cautious than mice, making them more difficult to trap. They can climb but prefer to stay closer to the ground.

Roof rats are smaller than Norway rats, weighing about 7 ounces. They have light, slender bodies that are gray in color with smooth coats. They have thick, hairless, scaly tails that are dark in color. Roof rats have pointed snouts with large ears. Roof rat droppings are dark with both ends pointed. They will also eat just about anything but prefer fresh grains and meat. They are nocturnal and timid in nature. Because of this, they can be difficult to trap. They are excellent climbers and are more often found nesting in walls, attics, and trees.
Regardless of whether you have mice, Norway rats, or roof rats, all of these rodent species can cause damage to your home and property by chewing through wires, pipes, insulation, and drywall. They can also cause damage to furniture and carpets. All rodents can contaminate food and countertops. Serious diseases caused by rat droppings and mouse droppings include Hantavirus, salmonellosis, and more. They all reproduce quickly and a minor problem can become a major infestation in no time.
Keeping these pests out of your home is critical to helping protect the safety of both your family and your property. Here are some rodent control tips you can implement in and around your home:
FACT. Rats are one of the most common pest issues homeowners face. Rats are known for being destructive by gnawing on structures in and around your home including utility pipes, wood structures, and wiring. In addition to the structural damage rats can cause, it is also possible for rats to pose serious health risks to humans. Diseases caused by rats can be transmitted through bites or scratches. Rat feces illness can be transmitted to humans through rat droppings and urine left around your home. Humans can also get sick through contaminated food caused by rats running across countertops where food is later prepared.
Just how sick can rats make you? Here are some common rat-borne diseases found in the United States.
Hantavirus pulmonary syndrome is a viral illness spread by deer mice, cotton rats, rice rats, and white-footed mice. HPS is spread by direct contact with rodents or their urine and feces, by breathing in dust contaminated with urine or droppings, or by bite wounds. Symptoms in the first phase of the virus include fatigue, fever, muscle aches, headache, dizziness, chills, nausea, vomiting, and abdominal pain. The symptoms then progress to coughing and shortness of breath. HPS is a severe and sometimes fatal respiratory disease with a 38% mortality rate. There is no specific treatment, cure, or vaccine for hantavirus infection.
Leptospirosis is a bacterial disease spread by rodents worldwide by either eating or drinking food and water contaminated with urine or contact through the skin or mucous membranes with water or soil that is contaminated with urine. Without treatment, leptospirosis can lead to kidney damage, meningitis (inflammation of the membrane around the brain and spinal cord), liver failure, respiratory distress, and even death. Common symptoms include fever, chills, headache, muscle aches, abdominal pain, vomiting, jaundice, diarrhea, and rash. The symptoms are often mistaken for other illnesses. If not treated, the second phase of symptoms includes kidney or liver failure or meningitis. The disease lasts between 1 and 3 weeks. Leptospirosis is treated with antibiotics.
Rat-bite fever is a bacterial illness spread by rats and possibly mice. The disease occurs worldwide and is spread through bites or scratches from an infected rodent, contact with a dead rodent, or eating or drinking food and water that is contaminated by rat feces. If not treated, RBF can be a serious or even fatal disease. RBF is not spread from one person to another. The early symptoms of RBF can be similar to the symptoms of other medical conditions. Common symptoms include fever, headache, muscle pain, headaches, vomiting, joint pain, and rash. If the illness progresses, more severe complication can arise such as abscesses, hepatitis, kidney infections, pneumonia, meningitis, or infections in the heart. RBF is treated with antibiotics.
Salmonellosis is a bacterial disease found worldwide that is spread by rats and mice. Salmonellosis is spread through eating or drinking food and water that is contaminated by rat feces. Salmonellosis is an infection caused by the Salmonella bacteria. Although commonly spread when a person eats contaminated food, the bacteria also can be passed between people and animals. Common symptoms include diarrhea, vomiting, fever, and abdominal cramps. Salmonella infections in people usually resolve within 5-7 days, and most do not require treatment other than drinking plenty of fluids. People with severe diarrhea may need to spend time in a hospital getting rehydrated with intravenous fluids.
Rat-borne diseases can cause serious and sometimes fatal illnesses in humans. The best way to avoid these diseases is to prevent rats from infesting your home in the first place. Here are some common home rat prevention tips:
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While we most often think of wildlife being a problem in the winter months, these animals don’t just disappear when the weather gets warm. Wildlife can still be quite active in the summer, wreaking havoc on our homes and gardens. Whatever the time of year, preventing and controlling these nuisance pests is of the utmost importance, as they not only cause damage to homes and property, but can also pose significant health risks to both humans and pets. Wildlife prevention (also known as wildlife exclusion) is the first line of control against critters; however, once they have established themselves in or around your home, wildlife removal becomes a more necessary option. Let’s look at some common summer wildlife, as well as ways to exclude them from your home.

Snakes are cold-blooded animals that require heat and sunlight for energy. They are more active in the summer months because they require more energy for mating. Too much exposure can overheat them so snakes are typically more active in the early morning and late evenings or at night in the summertime. They will also seek out shelter during the hottest parts of the day in cool, dark places like underneath rocks and decks or in basements. Snakes will choose where they live based on the availability of food, shelter, and shade.
To prevent snakes this summer:

While bats are scary to many people, they are actually quite beneficial at keeping insect populations down. In the southern United States, many bat species are active year-round. Bats enter homes through openings. They can cause damage in homes by ruining insulation, causing structural damage when their urine soaks through to sheet rock or particle board, and their urine and feces causing health concerns for occupants of the home. Bats also carry serious diseases such as rabies, with 1 to 3 cases of bat transmitted rabies occurring each year. Bats are nocturnal and emerge at dusk in search of food. Female bats search for summer roosts where they stay until they have their young. For this reason, unless there is a threat to public health, eviction or exclusion of bats should not take place between April and August. Colonies will disband in late summer as bats leave for their winter roosts.
To prevent bats in the summer:

Armadillos mate in the fall, with their young born in the spring, making them very active in the summer months. They prefer habitats near streams or other water sources with sandy or clay soil. They are often found in forests, woodlands, prairies, salt marshes, coastal dunes, pastures, cemeteries, parks, golf courses, and crop lands. They love to nest in rock piles, around trees and shrubs, and under rock slabs. Armadillos dig burrows that can be up to 25 feet long, which can significantly damage tree roots. These burrows can also cause flooding if they are dug around crawlspaces, patios, or walkways. Armadillos have poorly developed teeth and limited mobility. they have poor eyesight but a keen sense of smell. They have very few natural predators. They are strong diggers which they rely on to find shelter and food and causing most of the damage around your home and property. Armadillos will eat fruit (especially from gardens and compost piles), grubs, worms, beetles, wasps, ants, millipedes, centipedes, and snails.
To prevent armadillos in the summer:

Opossum females are laden with their young in the summer months, making them more active in their search for food. Opossums are found throughout the United States. They live in trees and will stay in them as much as possible. They also prefer wet areas like marshes and swamps. Opossums are nocturnal and will forage for food at night. They are beneficial in they eat harmful and unwanted pests around your home. They prefer to eat snails, slugs, spiders, cockroaches, rats, mice and snakes. They will also eat nuts, grass, fruit, roadkill, and garbage. They are rarely aggressive and will play dead when they feel threatened.
To prevent opossums this summer:

Raccoons are highly intelligent and curious animals. They typically give birth to their young in April and May, making them very active in the summer months. They are found throughout the United States. They prefer to live in heavily wooded areas with access to trees, water, and vegetation. They are extremely adaptable, however, and will make their homes in attics, sewers, barns, and sheds. They are dexterous, capable of opening doors, jars, bottles, and latches. They are known to carry several bacterial diseases. Raccoons are nocturnal animals, searching for food at night. They will eat almost anything including birds, eggs, fish, shellfish, frogs, fruit, insects, nuts, seeds, and even snakes. They are known to destroy gardens, tip over garbage cans, and cause structural damage in their quest for food.
To prevent raccoons this summer:

Rats are active year-round. The summer provides them with ample sources of food making them very active. They are also busy making burrows and storing food in preparation for the winter. Rats can reproduce very quickly so control and elimination can be extremely difficult. They are excellent climbers and are well adapted to living in human environments. Rats can contaminate food, cause fire hazards by chewing through wires, and their urine and feces can cause serious health concerns.
To prevent rats this summer:
Prevention is always a good first step at keeping wildlife away. Once you have a wildlife issue, however, prevention usually needs to shift to removal and exclusion. Consider contacting a professional wildlife control company who can assess your wildlife issue and provide you with the safest and most appropriate treatment and prevention options.
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Rodents are one of the most common pests that come into our homes in the winter. Rodents are in search of 3 things – food, water, and shelter – and they can find all 3 of them in and around our homes. Squirrels, raccoons, rats, and mice are some of the most frequently seen rodents in the colder months. Rodents can cause significant damage to property and can also be a big health risk to humans. Prevention is critical in managing and preventing an infestation of rodents. Check out these tips to keep the rodents out this winter: