Rat infestation in many world cities appears to be soaring, especially in Washington, and a new study blames warming ...

Washington's rising rat reporting trend was three times greater ... Each litter is eight to 16 baby rats, Richardson said: “That is a recipe for accelerated population growth.” ...

Each litter is eight to 16 baby rats, Richardson said: “That is a recipe for accelerated population growth.” A rat is seen in Central Park in New York, March 19, 2017. Credit: AP/Seth Wenig ...