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This is an automated archive made by the Lemmit Bot.
The original was posted on /r/interestingasfuck by /u/SignificantScarcity on 2025-08-11 14:06:13+00:00.
Original Title: If Holly (Ilex aquifolium) finds its leaves are being nibbled by deer, it switches on genes to make them spiky when they regrow. So on taller Holly trees, the upper leaves (which are out of reach) have smooth edges, while the lower leaves are prickly.
