`Residents of a neighborhood next to the University of Arizona say small white rats have been swimming through sewer pipes and into their toilets.
Laura Hagen Fairbanks, spokeswoman for the county’s Wastewater Management Department, said she doesn’t know where the rodents come from, however they are the kind that researchers use in labs.
University representatives point out that the same type of white rats are sold in pet stores as food for snakes and other animals. [..]
Hagen Fairbanks said no one knows why the rats are found in only one small area of town or why they show their faces only once or twice a year.’