Ah, rats! Researchers say some other critter likely created Chicago's 'rat hole' sidewalk landmark

National News Ah, rats! Researchers say some other critter likely created Chicago's 'rat hole' sidewalk landmark By TODD RICHMOND - Associated Press 13 mins ago Ah, rats! Researchers have debunked the origin of Chicago's so-called “rat hole," concluding some other critter was likely responsible for cre…