Hamster wheel

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A hamster wheel or running wheel is an exercise device used primarily by hamsters and other rodents, but also by other cursorial animals when given the opportunity. Most of these devices consist of a runged or ridged wheel held on a stand by a single or pair of stub axles.

Excerpt from the Wikipedia article “Hamster wheel”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Mylius, CC BY-SA 3.0, via Wikimedia Commons.