British naturalist John Berkenhout dubbed them Norway rats because of incorrect rumors that they had come over on lumber ships from Norway, Corrigan said. The name stuck. Rats use their teeth ...

including the RSPCA and British Veterinary Zoological Society, and that some councils had already imposed the ban and had seen "no negative" consequences. Gareth Rats have "diamond sharp teeth ...

A large aquatic rodent with bright orange teeth is causing environmental destruction ... Nutria — which resemble a cross between a beaver and an over-sized rat — can grow to be two feet ...