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Why do the leaves of a cactus have thorns?

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Cactus thorns are the highly modified leaves of plant lineages that evolved to compete in desert conditions. Plant leaves are typically wide and thin and have a big surface area to volume ratio and thus can easily heat up and are the main route for evaporation and water loss from a plant. read more

Stems actually. The thorns ARE the leaves. Here’s your answer. Prehistoric American Camel: “Hmm, gosh I'm thirsty in this big dry desert of Nevada or Mexico. read more

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Why do cactus plants have thorns? - Quora
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Further Research

Why Are Cacti Covered in Spines?
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Why Do Cactus Have Spines
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