Chicago rat hole
The Chicago rat hole is a hole shaped like a rat that was formerly in the sidewalk of West Roscoe Street in the Roscoe Village neighborhood of Chicago, Illinois, United States. After several decades, it received widespread attention on social media in early 2024, attracting tourists to the site. City officials removed the sidewalk slab containing the hole several months later, and it is currently stored in City Hall.
An apparent example of accidental lifecasting, the hole was described by The New York Times as "Chicago's Stonehenge". Some neighbors and wildlife experts speculated that the impression was made by a squirrel rather than a rat; a 2025 research paper in Biology Letters found this to be the most likely case, based on comparison of the cast with anatomical data from squirrel populations.
History
The hole gained worldwide attention on January 6, 2024, via a tweet by Chicago-based comedian and writer Winslow Dumaine. In what has been described as a "pilgrimage", many Chicago residents visited the hole and made offerings to it, such as coins, flowers, candles, cheese, cigarettes, alcohol, children's toys, food, and estradiol pills. One group of visitors took shots of Chicago specialty Malört beside the hole, before leaving the bottle as an oblation. The Riot Fest Historical Society also dedicated a plaque at the site of the hole.Despite its newfound attention in 2024, the hole had existed for at least 20 to 30 years, according to locals. A local softball team has been using the rat as its unofficial mascot since around 2018.
The hole's notoriety reached political and business channels. Ann Williams, the state representative for Illinois's 11th district, posted an online video promoting the hole, calling it "the jewel of the 11th district". The Chamber of Commerce for Lakeview and Roscoe Village ran a naming contest for the hole, with "Splatatouille"—a reference to the film Ratatouille—beating the other four finalists.
The hole was filled in with plaster or cement by an unknown party on January 19, 2024. City officials later confirmed they had not filled in the hole. Ann Williams posted a video stating "we are shocked and saddened" by the news, and "are closely monitoring the developing situation". Local residents attempted to excavate the hole, using their hands and implements such as ice scrapers and license plates. Eventually, a woman cleaned out the hole and restored it to its original condition.
Following the restoration, Williams wrote "This is what community is all about." Shortly afterwards, an engagement and a marriage ceremony took place at the hole. Some residents of West Roscoe Street expressed frustration with the hole's newfound viral status, with some locals citing public nuisance, vandalism, and accumulation of garbage on the sidewalk.
On April 24, 2024, the Chicago Department of Transportation removed the sidewalk slab containing the hole while keeping it intact. A "Rathole Music Fest" was held at a venue under three miles south of the site in June, featuring local bands as well as burlesque and poetry performances.
The slab as of January 2025 is stored in City Hall, pending a proper place to display the slab, having been transferred into a case. Chicago streets and sanitation commissioner Cole Stallard said that those at City Hall would "like to be able to showcase it so more people can enjoy it." Dumaine began selling plaster casts of the hole, with all proceeds going to Northside women's homeless shelter Sarah's Circle.
Debate over origin
Despite the hole's popular name, some locals believe it was formed by a squirrel. The director of Lincoln Park Zoo's Urban Wildlife Institute, Seth Magle, told NBC Chicago that he believed it likely that a squirrel fell on the wet concrete from a tree. Magle also clarified that the thinness of the tail cavity, used by some to argue in favor of it being a rat hole, should not be considered, given that fur does not always leave impressions. Supporting this theory, one resident stated that an oak tree had existed above that section of the sidewalk that had since been cut down.A 2025 paper published in Biology Letters by scientists from the University of Tennessee and New York Institute of Technology College of Osteopathic Medicine analyzed several species of mammals present in Chicago and concluded that the imprint was most likely to have been made by an Eastern gray squirrel.