Chicago rat hole

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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 (mainly Twitter) 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.