Story perspectives

Squirrel Behind Viral 'Chicago Rat Hole,' Study Reveals

10/15/2025

38 5

Summary

Story summary

Researchers concluded in a Biology Letters study that the Chicago sidewalk indent nicknamed the "Chicago Rat Hole" was likely created by a squirrel, with 98.7% probability.
In January 2024, the hole gained viral attention in Chicago.
Researchers analyzed photos and compared measurements with local rodent specimens.
They propose renaming it the "Windy City Sidewalk Squirrel."
The study highlights the value of scientific inquiry in understanding the natural world.

1 of 1

Story summary

Researchers concluded in a Biology Letters study that the Chicago sidewalk indent nicknamed the "Chicago Rat Hole" was likely created by a squirrel, with 98.7% probability.
In January 2024, the hole gained viral attention in Chicago.
Researchers analyzed photos and compared measurements with local rodent specimens.
They propose renaming it the "Windy City Sidewalk Squirrel."
The study highlights the value of scientific inquiry in understanding the natural world.