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TIL ecologists once thought Beaver dam-building was an amazing feat of planning, indicative of the high intellect. This was tested when a recording of running water was played in a field near a beaver pond. Although on dry land, the beaver covered the tape player with branches and mud.

https://en.wikipedia.org/wiki/North_American_beaver
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gsowgh/til_ecologists_once_thought_beaver_dambuilding/