Many species of barrel cactus (Ferocactus sp.) have nectaries at the base of their spines. These nectaries are used to attract ants which can help protect the plant from herbivores. Here two tiny Brachymyrmex ants feed from a nectary.
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This image was captured with a Canon EOS 20D, using a Canon MP-E 65mm 1-5x macro lens.