Roof rats (Rattus rattus) are the most common rat species in the Phoenix metropolitan area. Unlike Norway rats, roof rats are agile climbers that prefer elevated areas — attics, rafters, palm trees, and the upper portions of structures. They are strongly attracted to citrus trees, which are abundant in Arizona neighborhoods, and use overhanging branches as highways into homes. A single pair of roof rats can produce up to 40 offspring per year.
👁Warning Signs
Droppings (banana-shaped, 1/2 inch long) in attics, along walls, or near food sources. Gnaw marks on wood, wiring, and food packaging. Greasy rub marks along walls and beams. Scratching or scurrying sounds in the attic at night. Partially eaten citrus fruit on the ground.
⚠Health & Property Risks
Roof rats chew through electrical wiring (a leading cause of house fires), insulation, and structural materials. They contaminate food and surfaces with urine and droppings, spreading diseases including leptospirosis and salmonellosis.
Prevention Tips
Trim all trees and shrubs at least 4 feet from the roofline. Harvest citrus promptly and remove fallen fruit. Seal all gaps larger than 1/4 inch around the roofline, eaves, and utility penetrations. Store food in sealed containers.
🛡Professional Treatment
Exterior bait stations, snap traps, and exclusion work to seal entry points. A multi-visit program is required to eliminate the population and prevent re-entry.
Frequently Asked Questions — Roof Rats
Dealing with Roof Rats?
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