Scientific name: Rattus norvegicus

NORWAY OR SEWER RAT

Morphology: They can measure up to 40cm. long, are long and robust size, the tail is shorter than the body and head, weighing 350 to 500g.es brown to black with lighter belly and varies depending on the environment, flat nose and ears small.

Habitat and food: Typically live in underground burrows they dig, being commonly found in any city's sewer system. Prefers the ground, but can be found in elevated floor accessed by channels and connections of the building. Its territory covers 50 m. from his cave. Hierarchical live in colonies similar to mice, but with more individuals, are nocturnal, they need about 30g. daily food and about 40ml of water per day.

Life cycle: They have a management period of 3 weeks, resulting from 4-7 litters per year and 7-12 pups.