One of the speculations about cactus spines is that they are a means of defense. This might be a good theory except for the fact that many cactus spines are not hard and pointy but soft like hair. The Old Man Cactus is a good example. Some cactus have spines that are almost non-existent or so small as to be ineffective as a protective measure. So why do cactus have spines? Maybe there is a fundamental universal question here.
It's my first time to see hairy cactus! Thank you.
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