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The original was posted on /r/todayilearned by /u/pierraltaltal on 2025-02-01 17:09:44+00:00.

Original Title: TIL that Acacia trees developped a defense response to giraffe browsing by increasing their thorn length, tannin production within leaves and airborne tannin release. This triggered a change in the giraffe’s behaviour which adapted to move upwind and eat fewer leaves per trees.