Roof Rat

The roof rat, scientific name *Rattus rattus*, is a medium-sized rodent typically weighing 150-250 grams, with a slender body and a distinctive pointed muzzle. Its tail, noticeably longer than its head and body combined (18-25 mm vs. 15-20 mm), and large, hairless ears are key distinguishing features from the Norway rat. Under optimal conditions, a female can produce 4-6 litters annually, each comprising 5-8 pups, reaching sexual maturity in approximately 3-4 months. Their lifespan generally ranges from 12-18 months in the wild, but can extend up to three years under ideal laboratory conditions. They thrive in warm, humid environments, with ideal temperatures between 20-30°C and relative humidity above 50%, which expedites their development and reproductive success.

Roof rats are predominantly nocturnal, with peak activity occurring shortly after dusk and before dawn, though they can be observed during the day in heavily infested areas or when disturbed. They exhibit complex social structures, living in colonies with established dominance hierarchies, and use a variety of olfactory cues, including urine and pheromones, for communication and territory marking. Their agility makes them expert climbers, utilizing utility lines, branches, and rough surfaces to travel vertically and horizontally for food and harborage. As omnivores, their diet is highly opportunistic, favoring fruits, nuts, and grains, but also consuming insects, snails, and other readily available food sources. They are significant vectors for pathogens like *Yersinia pestis* (plague), *Leptospira interrogans* (leptospirosis), and various *Salmonella* species, posing substantial public health risks.