Pseudomyrmex spinicola - Acacia Ants
Among the most remarkable mutualisms is that between the Central American swollen-thorn Acacia trees and Pseudomyrmex ants. The ants are obligate inhabitants of the Acacia and protect their host trees from herbivores and from competing plants. The plants in return house and feed their protectors. Here a worker ant drinks from one of the tree's many nactaries.
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This image was captured with a Canon EOS 20D, using a Canon MP-E 65mm 1-5x macro lens.