Rat control, along with poisons should only be applied by trained professionals to reduce the possibilities of secondary poisoning to other non target species such as your dog or cat and the surrounding wildlife.
Variations of rodenticides are freely available from DIY outlets at a greatly reduced cost but generally are not the full strength which professionals use resulting in you having to buy larger quantities, resulting in a false economy.
Quite commonly we invite rats into our own personal space unknowingly. A classic call out for rats around the home is started from over feeding the bird table. By offering too much food, this gets deposited around the floor encouraging vermin to come live with you.
Once a regular food source is established, rats will dominate that area bringing disease and destruction with them. Rats will use sewers as motorways to move around, which is one of the places where a Professional will inspect on his survey - would you?
Rattus norvegicus
Common names: Norway rat; Common rat; Brown rat; Wharf rat; Sewer rat
Adult Weight: 300 grams
Length (head + body): 200-250 mm
Length (tail): 150-200 mm, shorter than head and body
Fur & colour: Harsh and shaggy. Brown and black on upper head and body, grey or off white underneath.
Ears & hearing: Thick, opaque, short with fine hairs. Excellent sense of hearing.
Eyes & sight: Small. Poor sight, colour blind. Snout, smell and taste: Blunt, Excellent sense of smell and taste.
Snout, smell and taste: Blunt, excellent sense of smell and taste
Droppings: In groups, but sometimes scattered. Ellipsoidal capsule shaped, about 20 mm long.
Habits & habitat: Does burrow. Lives outdoors, indoors and in sewers. Nests in burrows. Can climb, though not agile. Very good swimmer. Conservative, somewhat predictable in habit. Will avoid unfamiliar objects, e.g. bait trays, placed on runs, for some days. Need to gnaw to keep their constantly growing incisor teeth worn down. Creatures of habit; will leave regular runs to & from feeding areas.
Feeding habits: Omnivorous, more likely to eat meat than Rattus Rattus. Consumes up to 30 grams per day, drinks water or eats food with high water content. Will hoard food for future consumption. Most likely to eat at night. Range 50 metres when looking for food.
Life cycle: 9-18 months
Sexual maturity: 2-3 months
Litter size: 8-10 offspring
Maximum reproduction rate: 7 litters per year