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If Holly (Ilex aquifolium) finds its leaves are being nibbled by deer, it switches genes on 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
@CriticalCupcake WOW! didn't know!
@FernLovebond 🤭 🤭 nabbed off the same reddit
@CriticalCupcake very cool. Nature is endlessly fascinating.