I am not sure why I keep running across this stuff.
http://www.guardian.co.uk/environment/2008/feb/10/flooding.climatechange Driven out of sewers by summer floods and an urban building boom, then nurtured by warmer winters and the leftovers of fast food, rats have been moving into homes, gardens and even cars around the country.
Rat-catchers and companies selling poison and traps are reporting a boom in business, with urban housing estates among the worst affected areas. Long-term growth in rodent populations is also blamed on a decline in 'sewer-baiting', the practice of laying down poison twice a year to prevent rat numbers building up underground.
Because rats breed on average five times a year, with seven or eight in each litter, growth can be rapid. The recent surge in numbers has been linked to a boom in urban development - not least the preparations for the 2012 London Olympics - and last summer's floods, which drove rats out from underground, through holes and cracks in pipes and drains.
Rentokil, the UK's largest pest control company, said demand rose by more than a quarter last year as hits on its website trebled. Killgerm, the country's biggest seller of rat poison, said sales rose by a quarter in 2007.