Norway Rat
Rattus norvegicus
The largest common rat in Singapore, known for burrowing behaviour and exceptional swimming ability. Often found at ground level and in sewer systems, Norway rats are significant pests in food establishments and can cause severe structural damage.
Risk Level
Critical
Active Period
Primarily nocturnal, may forage during day if population is high
Common Locations
Sewers, Basements
Size
Up to 40cm including tail, body weight 200–500g
How to Identify Norway Rat
Physical Appearance
Large, heavy body with coarse brown-grey fur. Blunt snout, small ears relative to body, and a thick tail shorter than head-and-body length combined. Larger and stockier than the Roof Rat.
Size
Up to 40cm including tail, body weight 200–500g
Common Locations
Sewers, Basements, Ground floors, Outdoor burrows
Habitat & Behaviour
Activity & Breeding
Excellent burrower, creating extensive underground tunnel systems. Strong swimmer that navigates sewers and drains. Neophobic (cautious of new objects). Creates defined runways along walls. Can gnaw through wood, plastic, and soft metals.
Active Period
Primarily nocturnal, may forage during day if population is high
Signs of Norway Rat Infestation
Health & Property Risks
Prevention Tips
Frequently Asked Questions
Other Rodent Species
Need Help With Norway Rat?
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