Rats

The common rat (rattus norvegicus), also known as the brown rat, is the species most commonly found in city areas.

The adult rat is a thickset creature. It weighs from 100-500 grams and is typically 200-270 mm long. Its fur can be various colours ranging from black through to white, but they are most commonly grey. Its tail is shorter than its head and body.

Common rats are widespread in both city and country areas, and can be found anywhere offering shelter and food. Over 80% of rat infestations in London originate from sewers. Rats are efficient burrowers forming holes which average 100mm in diameter. Sometimes a complicated tunnel system with several openings is produced.

Typically, such a system can be found around the outside of buildings, in embankments, rubbish tips, overgrown gardens. Rats, by nature, are generally most active at night, but may be seen searching for food and water during the day.