A hungry rat spotted in one of Buckingham Palaces kitchens in London left the Queen Elizabeth II horrified. The palaces staff has called in a pest control squad that shortly arrived to address the situation. The British Pest Control Association admitted that the country witnesses an invasion or a new species of rodents with immunity against poison, which raised anger among Britons. The proliferation of rats and mice has become a major problem hitting the ancient buildings of Britain such as the royal palace that dates back to 1703, the parliament, and other governmental edifices. It is reported that officials have given staff, in particular kitchen workers, basic training such as shutting cupboard doors and sweeping away bits of food in order to stop the problem spreading. The tiny animals developed a genetic mutation known as LG20, which renders many toxins useless. A spokesperson for the British Pest Control Association admitted that the long-tailed rodents had grown increasingly immune to the poison.