TIL beavers build their dams as an instinct to stop the sounds of water leaks. If a speaker is playing just the sound of running water, a beaver will build a dam over it. This is even if it’s over concrete with no visible water, or if an actual nearby leaky water source is quieter than the speaker.

Read more: https://www.mentalfloss.com/article/67662/sound-running-water-puts-beavers-mood-build

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