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Look at the spines on these cacti!
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What Are Cactus Glochid Spines? | Gardener's Path
Why Are Cactuses Spiky? | Vermont Public
Scientists study puncture performance of cactus spines | Illinois
How To Remove Cactus Spines From Your Perforated Body | SoCal Wanderer | Food & Discovery | PBS SoCal
Spines, Photosynthetic Tricks, and Other Marvels of Cacti Evolution - Nash Turley
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Scientists study puncture performance of cactus spines | Illinois
Photo gallery: cactus spines
Glochid - Wikipedia
Will Cactus Spines Regrow – Fixing Broken Cactus Spines
