A rat-shaped indent on a Chicago sidewalk went viral early last year, with troves of people venturing to the hole bearing coins and other offerings. However, a new study suggests the so-called "Chicago Rat Hole" wasn't actually made by a rat — it was probably the imprint of a squirrel.
By comparing characteristics of the hole with information about the local rodent populations, researchers determined that a squirrel most likely made the impression. The study was published Wednesday (Oct. 15) in the journal Biology Letters.
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