Pseudomyrmex spinicola - Acacia Ants
Swollen-thorn Acacia trees in Central America are protected by aggressive Pseudomyrmex ants. In return, the plants house the ants in specialized thorns and feed them with nectaries and protein-rich food bodies. Here a worker ant stands over nectar-producing glands at the base of a leaf. A few of the Acacia-ant species hold their abdomens tucked forward under the body, an unusual stance for a Pseudomyrmex.
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This image was captured with a Canon EOS 20D, using a Canon MP-E 65mm 1-5x macro lens.