Norway Rat in Coastal Alabama

Scientific name: Rattus norvegicus. Common name: Norway rat, brown rat, sewer rat. Family: Muridae. Status in Mobile-Baldwin: common in urban Mobile, around restaurants, warehouses, port facilities, and storm-drain systems.

Identification

Adults are 12–18 inches total length, with the tail shorter than the body. Body is heavier and stockier than the roof rat. Color is brown to grayish-brown above, lighter below. Ears are smaller and hairier than roof rat. Snout is blunt. Droppings are large (18 mm) with blunt ends.

Biology and life cycle

Sexual maturity at 3 months. Females produce 5–7 litters per year of 6–12 young. Lifespan 12–24 months. Strictly nocturnal in occupied buildings. Burrowing behavior is distinctive — Norway rats dig dens with 2–3 entry holes, typically against foundations, under slabs, or in undisturbed soil within 100 feet of a food source.

Habitat and range in Mobile-Baldwin

Ground-dwelling and burrow-building. Sewer systems, storm drains, restaurant dumpster areas, food-warehouse perimeters, port-facility infrastructure, and any urban area with consistent organic-waste pressure. Downtown Mobile, the Port of Mobile, restaurant clusters along Airport Boulevard and on the Causeway, and food-distribution warehouses all have year-round Norway rat populations. Coastal Baldwin sees Norway rats around commercial seafood processing and bayside restaurant areas.

Risk to homeowners

Same disease-vector profile as roof rat: leptospirosis, salmonellosis, rat-bite fever, historical murine typhus. Norway rats are the species most associated with sewer-borne pathogens because of their direct sewer-system access. Property damage: foundation burrows that can undermine slabs and concrete steps, electrical wiring chew damage in basements, contamination of stored goods in warehouses.

Prevention

Eliminate burrow opportunities: clear vegetation against foundations, remove debris piles, maintain concrete-edge transitions. Secure dumpsters and trash cans — heavy lids, daily emptying, no overflow. Seal foundation cracks and gaps where utilities enter the structure. Maintain weep-hole screening on brick exteriors. For commercial properties: regularly inspect dumpster pads, grease-trap covers, and the back-of-house perimeter.

Treatment options

Exclusion plus extensive snap-trapping. Anticoagulant tamper-resistant bait stations placed along burrow exits and travel paths. Burrow baiting and burrow collapse are professional-only techniques requiring ADAI licensure. Commercial settings often need multi-month treatment cycles with documented monitoring per Alabama Department of Public Health food-facility requirements.

When to call

Burrows visible against foundations, dropping accumulation in basements or warehouses, gnaw marks on stored food packaging, or any sighting in a food-service setting (immediate). Call us: (251) 555-0100.

Related

See: Rodent Control Mobile · Restaurant Pest Control · Warehouse Pest Control · Compare to roof rat