Drinking bird

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

A drinking bird, also known as the dunking bird, drinky bird, water bird, and dipping bird, is a toy heat engine that mimics the motions of a bird drinking from a water source. They are sometimes incorrectly considered examples of a perpetual motion device.

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

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