Rats are far less common than mice in Michigan homes, but when present they create more serious problems. They are larger, stronger, and capable of causing significant damage to structures, insulation, and wiring. Effective rat control requires proper species identification, exclusion, and professional control methods.
Norway Rats
Overview
Norway rats are the most common rat species found in Michigan. They are strong burrowers and are typically associated with ground-level activity.
Behavior
Norway rats nest in soil, under concrete slabs, inside crawlspaces, and along foundations. They are excellent climbers but prefer lower levels and basements when entering structures.
How to Identify Them
Norway rats are large with thick bodies, blunt noses, small ears, and coarse brown or gray fur. Droppings are larger than mouse droppings and commonly found near foundations or lower floors.
Why They’re a Pest
They cause extensive gnawing damage, contaminate food and surfaces, and can compromise foundations through burrowing. Their size makes them especially destructive.
Roof Rats
Overview
Roof rats are less common in Michigan but do occur, particularly in urban areas or near food sources.
Behavior
They prefer elevated nesting locations such as attics, wall voids, and upper levels of structures. Roof rats are agile climbers and often access buildings through rooflines and overhanging vegetation.
How to Identify Them
Roof rats are slimmer than Norway rats with longer tails, larger ears, and a more pointed nose. They are typically black or dark brown.
Why They’re a Pest
Roof rats can cause damage to attics, insulation, and electrical wiring and are difficult to control without addressing high-level access points.
Common Rat Entry Points
Overview
Rats require larger openings than mice, but still take advantage of structural gaps that often go unnoticed.
Behavior
They follow edges, pipes, and structural lines until they find access into basements, crawlspaces, or upper roof areas.
How to Identify Entry Areas
Common rat entry points include:
Gaps along foundations and sill plates
Openings around utility and sewer penetrations
Damaged vents and crawlspace openings
Gaps under garage doors
Roofline gaps, soffits, and attic vents (especially for roof rats)
Why Entry Points Matter
Trapping alone will not solve a rat problem if access points remain open. Exclusion is essential to prevent repeat infestations and long-term damage.
Not Sure Which Rat You’re Dealing With?
Correct identification matters, as control strategies differ between rat species. If you’re seeing signs of rat activity or are unsure whether you’re dealing with rats or mice, use the contact form and we’ll help determine the best course of action.
