Facts about Norway Rats
- 10
Nocturnal foraging by Norway rats causes them to be most active during twilight hours and nighttime, when they venture up to 45 meters from their burrows to search for food.
- 09
Territorial Norway rats mark their environment with urine to establish dominance and communicate reproductive status, creating pheromone trails other rats follow to food sources.
- 08
Domesticated Norway rats have been selectively bred since the 18th century to produce over 400 recognized color and pattern varieties used in scientific research and as pets.
- 07
Ultrasonic vocalizations at frequencies up to 22 kilohertz allow Norway rats to communicate alarm signals and social information inaudible to human ears.
- 06
Norway rats can swim up to 0.8 kilometers and hold their breath underwater for up to 3 minutes, allowing them to access food sources through sewers and water systems.
- 05
The Norway rat's highly developed sense of smell allows it to detect odors as faint as one part per million, enabling navigation and food location in complete darkness.
- 04
A single Norway rat's teeth never stop growing throughout its entire life, requiring constant gnawing to maintain functional length.
- 03
In laboratory studies, Norway rats demonstrate cognitive abilities equivalent to a 3-year-old human child, including problem-solving and social learning capacities.
- 02
Norway rats reach sexual maturity in just 8-12 weeks and can produce up to 12 litters annually with 6-12 offspring per litter.
- 01
Weighing up to 500 grams, Norway rats can consume 30 grams of food daily and produce up to 40 droppings per night.