Most cactus spines are fairly straight, but the fishhook barrel cactus has spines curved into a fishhook shape (I don't mean barbs). Are there any good ideas why that shape evolved?

Close up spines fishhook cactus hi-res stock photography and

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fishhook barrel cactus (Cactus of Metro Phoenix (April 2021

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Fishhook cactus - Wikipedia

Most cactus spines are fairly straight, but the fishhook barrel

The Fish Hook Barrel Cactus is a True Sonoran Desert Beauty

fishhook barrel cactus (Cactus of Metro Phoenix (April 2021