The viral Chicago ‘Rat Hole’ almost certainly wasn't made by a rat

Chicago's 'Rat Hole' Mystery Solved

Researchers used paleontology methods to analyze the viral Chicago landmark, concluding it was likely made by a squirrel, not a rat.

A study published in Biology Letters on October 15 confirmed anecdotal accounts from residents and experts, debunking the 'Rat Hole' myth.

Chicago’s viral ‘Rat Hole’ is less rat splat, more squirrel squish.

Author's summary: Squirrel likely made Chicago's 'Rat Hole' impression.

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Science News Science News — 2025-10-15

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