What do they look like?
The common Norway or brown rat typically has brownish fur on its back and grey underneath but its colour can vary from white through to black. Adult body length is 200-270mm plus a tail length of 150-200mm.
The ship or black rat is nowadays rarely encountered in Britain but is smaller than the common rat and usually black in colour. It has large hairless ears and a tail that is longer than its head and body length.
Where do they live?
Common rats live in any situation that provides food, water and shelter. The common rat is the most widespread of its species and is widely found in urban and rural areas. In homes they will live in loft spaces, wall cavities, cellars or under floorboards. In gardens, they will burrow into compost heaps and grassy banks or under sheds. They are also commonly found living in sewer systems.
Ship rats are agile climbers and are usually found indoors, living in roof spaces. They are rarely found in sewer systems.
What are the signs of infestation?
- sightings of live or dead rats
- common rat droppings can be 12mm long and taper at both ends
- runs rats follow the same routes when travelling and leave trails through the grass and low vegetation
- footprints and tail swipes on muddy or dusty surfaces
- smears dark grey marks left on surfaces by repeated contact with rat fur
- burrows entrance holes 7-120mm in diameter in grassy banks, under tree roots, at the end of paving or drain cover surrounds
- nests sometime found indoors, in lofts or under floorboards
- gnawing rats gnaw continually, even on non-food materials, in order to wear down their front teeth
What do they eat?
Their favourite foods are cereal products, although they will eat almost anything that humans eat and some that humans don't including each other.
Most of the damage they do is by gnawing and ripping open packets. They also foul food with urine and droppings.
Why must rats be controlled?
- rats can transmit many diseases to humans, including Salmonellosis (food poisoning) and Weils disease
- rats will eat or contaminate food intended for humans. It is estimated that up to 5% of food produced world-wide is lost as a result of rodent activity
- they can cause damage to buildings and other structures by gnawing and burrowing
How can I get rid of them?
Rats are adaptable, highly mobile and breed rapidly. This combination makes rat control a difficult task for the untrained individual. Ealing Council provides a pest control service for the treatment of rats in domestic properties. Fully trained pest control officers will survey the infestation, then place poison bait in the most appropriate locations. Follow up visits will be made in order to ensure the success of the treatment.
How can I prevent an infestation?
Householders can assist in preventing infestation by some simple measures:
- remove potential nesting sites by keeping yards and gardens clean and tidy, and by cutting back overgrown areas
- stored materials should ideally be at least 19 inches off the ground to make access harder and identification of infestation easier. Products should also be kept away from walls
- do not feed wild birds or other animals to excess you may be feeding rats as well
- keep your home in good repair so that rats cannot gain access to it. Ensure that the drain inspection covers are in place and are in good repair
- do not leave household waste where rats can get at it. Food and food waste should be stored in sealed containers, including compost bins
- have a good housekeeping system for any outdoor pets, for example, rabbits in hutches or pigeons in lofts. Poor housekeeping can easily result in a rat infestation
Failing to report a rat infestation is not wise they do not disappear of their own accord.
Note: when using pesticides always follow the instructions on the label.