LONDON (AFP) - Britain is being attacked by a breed of "super rats" which have grown immune to modern poisons, pest controllers are warning.
The Financial Times quoted from a survey conducted by the National Pest Technicians Association, published Wednesday, showing Britain's rat population has soared to the highest levels in recent memory.
With rat infestations reported to local authorities rising 18 percent last year, the association was set to urge the government to launch an urgent investigation "before the situation gets out of control".
John Davison, the association's secretary, told the paper that rats were building up resistance to anti-coagulants introduced after they had already grown immune to warfarin.
Now, they are also avoiding more powerful poisons -- seeing the effect on other rats, they quickly learn to avoid the bait.
"Rats are very smart animals, which is why they're still here," he said.
The association also thinks global warming is playing its part, with fewer rats dying of cold in winter.
Other factors include the rise of fast food, which leaves more rubbish on the street.
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