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Cacti are considered types of succulents (all of which fall under the broad category of "plant"), and are often regarded as harmful because of their spines. Many cacti have sharp spines or hooks that stick out from their surface and serve as protection against other animals. These spines can be very sharp and may pierce the skin if hit. Some cacti like Opuntia have small fuzzy spines that seem harmless but when brushed up against or put into contact with human skin may string and look/feel like many tiny splinters. Like thorns, cactus spines have the potential to draw blood and scrape, pierce or cut and therefore may be considered harmful.

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14y ago

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