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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?

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Close up spines fishhook cactus hi-res stock photography and

Most cactus spines are fairly straight, but the fishhook barrel

The Fish Hook Barrel Cactus is a True Sonoran Desert Beauty

Most cactus spines are fairly straight, but the fishhook barrel

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