Last year, Chicago lost its unofficial title as America's “rattiest city." Now the push is on to see how low its ranking can go.

Chicago has a rat problem and it isn't likely to improve if the city doesn't come up with a new playbook, according to a just-released analysis by the city's watchdog.

According to a new study from Lincoln Park Zoo’s Urban Wildlife Institute, feral cats aren’t eating a lot of rats.

The latest tactic in Chicago's ongoing war against rats is to attack the problem at the source — with birth control instead of poison.

The primary reason rats continue to survive and thrive in places like Chicago is because humans provide an endless food buffet.

For the eighth year in a row, Chicago reigns supreme over Orkin’s Rattiest Cities list, but not everyone is convinced the city deserves the dubious distinction.

Chicago is the six-time holder of a title that no city wants.

Chicago’s recent designation as the country’s “rat capital” can be attributed in large part, a new study finds, to a particular type of home: rental units. 

Chicago residents logged more than 50,000 complaints last year about rats, according to a new survey that ranks the city as the “rat capital” of the U.S. We separate rat fact from fiction.

Last month, ornithologist Pete Marra sat down with Chicago Tonight to discuss his book detailing outdoor cats’ impact on U.S. bird populations. It was an interview that stirred up emotions on all sides. 

A Smithsonian ornithologist says outdoor cats are devastating bird populations.

Mayor Rahm Emanuel and the Department of Streets and Sanitation on Tuesday announced a pilot program that uses dry ice to curb rodent infestations.

Appearing at the site of the soon-to-be-demolished Children’s Memorial Hospital in Lincoln Park, Mayor Rahm Emanuel announced initiatives to respond to the city's growing rat problem.

Rat complaints are on the rise, according to city data. Find out what Mayor Rahm Emanuel and Ald. Carlos Ramirez-Rosa (35th Ward) are doing to address the issue.

Like most big cities, Chicago has a rat problem. Exterminators and local municipalities do their best to make a dent, but now there's a new approach to rodent control that is actually quite old. 

Chicago's Department of Streets and Sanitation says that requests for rat control services are down 15 percent this year.