Brown Rat

Rattus Norvegicus


The brown rat’s coat varies from light to dark brown, it is lighter on the belly. Brown rats generally reach a length of 20 to 25 cm, to which is added a long tail of 18 to 20 cm.
Its weight varies from 200 to 450 g, it is more stocky than the black rat. He is a poor climber but an excellent swimmer (he can swim up to 800m), so he can venture through the siphons.

Biological cycle

From 9 to 15 months. Sexual maturity after 12 weeks. From 3 to 10 juveniles per litter and up to 6 to 8 litters per year.

Living areas

Likes wet environments, digs burrows and nests. Often seen in sewers and landfills. Active at dusk and dawn, as well as at night.


Omnivorous, 25 to 30 g per day. Needs a lot of fresh water.


Damage to materials and structures due to gnawing (wood, electrical wires, pipes, insulation, etc.). Eats and pollutes food. Transmitted diseases: salmonella by feces, leptospirosis by urine, foot-and-mouth disease or murine typhus, plague via parasites such as fleas.

    Presence Signals

    • Excrements: long and dark excreta 10 to 20 mm long, often grouped, in the shape of a banana.
    • Scratches
    • Tooth marks
    • Footprints
    • Odours
    • Burrows and galleries