If you thought New York's rodent problem couldn't get any worse, a new study has some unsettling news. So-called "mutant" rodents are now crawling across New York. The poison that has been killing mice for decades is simply not working on a large and growing portion of the mouse population. Mutant Rodents Are Developing Rat Poison ResistancePhoto by Joshua J. Cotten on Unsplash a rat sitting on a piece of woodNorway rats, the large sewer rats that have become synonymous with New York, tell a slightly different story. New York State Is Crawling With Rats, 6 Cities Among Most InfestedNew York State Is Crawling With Rats, 6 Cities Among Most InfestedThe 10 Most Underrated Places To Live In New York