Cholla cactus are the epitome of self-protection. I cannot imagine a plant with more spines than these. But it is also important to understand that the spines are not just for show. If you happen to brush up against this cactus plant, the spines are so sharp that they will immediately stick into your skin. Then, in response to the moisture in your body, the spines immediately curl and become almost impossible to remove. As a result, they are extremely painful. Most of us learn about this process through experience.
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