Types of rodents in Michigan
When most people think of rodents, rats and mice are the first critters that come to mind. However, the rodent family (Rodentia) is actually the largest order of mammals in the world. With over 2,000 species found across the globe (two-thirds belonging to the Muridae family), rodents have adapted to thrive in nearly every environment, including right here in Michigan.
Understanding what types of rodents live in our Great Lakes State can help you anticipate their behaviors, recognize early warning signs of an infestation, and take action before these unwanted guests cause serious damage to your home or business.
The most common rodents found throughout Michigan include:
- House mice
- Deer mice
- Norway rats
- Roof rats
- Pack rats
- Meadow voles
- Squirrels
Common Michigan Rats & Mice
Though there are thousands of rodent species worldwide, most infestations in Michigan are caused by just a handful of types. The rats and mice that most frequently invade homes and businesses across our state include:
Mouse Mice
Originally native to Central Asia, the house mouse has become one of the most widespread rodents in the world. Michigan is no exception. These small pests feature pointed snouts, large ears compared to the rest of their body, and fur in varying shades of brown or gray.
House mice are incredibly adaptable, which is why they’re such a common problem in Michigan homes, particularly during our cold winter months. They’re known for contaminating pantries, leaving droppings in kitchen cabinets, and gnawing on things like electrical wires, insulation, and stored belongings. A single pair of house mice can produce dozens of offspring in just one year, making early intervention critical.
Deer Mice
Deer mice are a particular concern for Michigan residents, especially those living in rural areas or near wooded properties. These pests are notorious for spreading Hantavirus, a potentially deadly respiratory disease that can be contracted by inhaling dust contaminated with deer mouse droppings, urine, or saliva.
Deer mice are small, with large, dark eyes, oversized ears, and a distinctive white underbelly that contrasts with their brown or tan upper body. They’re drawn to secluded hiding spots and are most frequently found in barns, sheds, cabins, and outbuildings. Michigan’s abundant forests and farmland create ideal habitats for deer mice, making them a consistent threat throughout the state.
Norway Rats
Despite their name, Norway rats are believed to have originated in northern China before spreading to North America with European settlers in the 18th century. Today, they’re one of the most common rat species in Michigan’s urban and suburban areas, including cities like Detroit, Flint, Lansing, and Kalamazoo.
Norway rats are much larger than mice, typically measuring seven to nine inches in body length with an additional six to eight inch tail. They have blunt noses, small bald ears, and coarse brown or gray fur. These rats are among the most destructive rodent species and often burrow beneath homes, garages, and foundations to access basements and crawl spaces. They’re excellent swimmers and are commonly found near water sources, sewers, and drainage systems.
Roof Rats
Like their name implies, roof rats are known for their climbing abilities and preference for elevated spaces. They often gain access to Michigan homes by scaling nearby trees, vines, or utility lines to reach rooftops and attics. While less common than Norway rats in many parts of Michigan, roof rats can still pose a significant problem, particularly in older homes with accessible roof lines.
Though roof rats look somewhat similar to Norway rats, they can be distinguished by their sleeker build, pointed nose, and extremely long tail (often longer than their body), which they use for balance while climbing. Their fur is typically darker, ranging from black to dark brown.
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Other Types of Nuisance Rodents
Rats and mice are a constant problem for residents throughout Michigan, but they aren’t the only rodents that can cause headaches for homeowners. Our state’s diverse landscapes (from the forests of the Upper Peninsula to the suburbs of Metro Detroit) support a wide variety of rodent species that can invade your yard or, worse, your attic.
Pack Rats (Woodrats)
Pack rats, also known as woodrats, are found in rural and wooded areas of Michigan. Unlike other rats, pack rats are known for their peculiar habit of collecting and hoarding objects: everything from shiny trinkets to sticks, bones, and trash. They build large nests called “middens” that can damage outbuildings, vehicles, and even the exterior of homes. If you’ve found a strange collection of debris in your garage, shed, or under your porch, pack rats may be the culprits.
Meadow Voles
Meadow voles, sometimes called field mice, are a major concern for Michigan homeowners who take pride in their lawns and gardens. These stocky, short-tailed rodents create extensive tunnel systems just beneath the surface of grass, leaving behind unsightly trails and dead patches across your yard.
During Michigan’s harsh winters, meadow voles are known to gnaw on the bark of young trees and shrubs beneath the snow, a behavior called “girdling” that can kill ornamental plants and fruit trees. If you notice runway-like paths in your lawn come spring or bark damage at the base of trees, voles are likely to blame.
Squirrels
While squirrels are often viewed as harmless backyard visitors, these bushy-tailed rodents can become serious pests when they decide to move indoors. Michigan is home to several squirrel species, including gray squirrels, red squirrels, and fox squirrels, all of which are capable of causing significant damage to homes.
Squirrels typically enter attics through gaps in the roofline, damaged soffits, or uncapped chimneys. Once inside, they can chew through electrical wiring (creating fire hazards), tear up insulation for nesting material, and leave behind droppings and urine that contaminate your living space. The scratching and scurrying noises in your attic at dawn and dusk are often the first sign of a squirrel infestation.
Michigan Rodent Comparison
| Rodent Type | Size | Appearance | Common Habitat in Michigan | Primary Concerns |
| House Mouse | Two to four inches (body) | Pointed snout, large ears, brown/gray fur | Homes, apartments, restaurants, warehouses | Food contamination, electrical damage, rapid reproduction |
| Deer Mouse | Two to four inches (body) | Large eyes, white underbelly, bi-colored tail | Rural areas, cabins, sheds, barns, woodlands | Hantavirus transmission, structural damage |
| Norway Rat | Seven to nine inches (body) | Blunt nose, small ears, heavy body, brown/gray fur | Basements, sewers, burrows near foundations, urban areas | Severe structural damage, disease transmission, contamination |
| Roof Rat | Six to eight inches (body) | Pointed nose, large ears, long tail, dark fur | Attics, roof lines, trees, elevated structures | Electrical fires, insulation damage, disease |
| Pack Rat (Woodrat) | Six to eight inches (body) | Large ears, furry tail, gray/brown fur | Woodlands, rural properties, outbuildings, attics | Hoarding debris, structural damage, nesting in vehicles |
| Meadow Vole | Three to five inches (body) | Stocky body, short tail, small ears, brown fur | Lawns, gardens, meadows, orchards | Lawn damage, tree bark girdling, garden destruction |
| Squirrel | Eight to ten inches (body, varies by species) | Bushy tail, prominent eyes, gray/brown/red fur | Trees, attics, chimneys, soffits | Attic damage, electrical hazards, noise, entry point damage |
What Type of Rodent Do I Have?
Rodents are experts at hiding, which means you’re far more likely to notice the mess and destruction caused by an infestation than spot a live rat, mouse, or squirrel. Common signs of a rodent problem include:
- Droppings in cabinets, drawers, or along baseboards
- Gnaw marks on food packaging, wires, wood, or insulation
- Scratching or scurrying sounds in walls, ceilings, or floors (especially at night)
- Grease marks or rub marks along walls where rodents travel
- Nesting materials such as shredded paper, fabric, or insulation
- A musty or ammonia-like odor from urine accumulation
- Holes or entry points around your foundation, roof line, or utility openings
Because many rodent species exhibit similar behaviors and leave behind comparable evidence, it can be very difficult for homeowners to identify exactly which species they’re dealing with. That’s where a professional can help.
With years of experience and specialized training, a licensed pest control expert can accurately determine the type of rodent involved and assess the intensity of your infestation. From there, they’ll create a custom treatment plan tailored to your Michigan property, the specific rodent species present, and your unique circumstances.
Protect Your Michigan Home from Rodents
If you suspect rodents are invading your space, don’t wait until the infestation gets out of control. Rodent populations can grow rapidly, and the longer you wait, the more damage they can cause. And the more difficult (and costly) removal becomes.
Contact the experts at Griffin Pest Solutions today for fast, effective rodent removal and long-lasting pest protection. Our experienced technicians understand the unique challenges Michigan homeowners face, from cold-weather invasions to the specific rodent species found throughout our state. We’ll identify the problem, eliminate the infestation, and help you seal up entry points to prevent future issues.
Don’t let rodents take over your home. Call Griffin Pest Solutions now for a free inspection and customized treatment plan!
