Rats swarm around a bag of garbage near a dumpster in New York on July 7, 2000. A study published Wednesday, April 3, 2024, in the journal Science Advances suggests that brown rats crawled off ships arriving in the Americas earlier than previously thought and out-competed rodent rivals – infuriating and disgusting generations of city-dwellers and becoming so ubiquitous in North American cities that they’re known as common rats, street rats or sewer rats. (AP Photo/Robert Mecea, File)