Chicago’s Squirrel Hole 

Sorry, scientists, but the “Windy City Sidewalk Squirrel” is just not a catchy name.

This much-too-in-depth look at the animal most likely to have created Chicago’s rat hole is surely a strong contender for the 2026 Ig Nobels.

Sadly, as the caption under this image of the rat squirrel hole notes, “The imprint is currently not on display to the public”.