Cephalotes rohweri - Turtle Ant
Ants that nest in tree branches are often in stiff competition with each other for limited nest space. Two of the most common competitors for valuable real estate in new world forests are Crematogaster (at left), and Cephalotes (in nest hole). Here, a laboratory colony of Cephalotes rohweri demonstrates their defensive strategy. When presented with a Crematogaster worker, the Cephalotes respond by plugging the nest hole with the blocky head of a soldier ant.
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This image was captured with a Canon EOS 20D, using a Canon MP-E 65mm 1-5x macro lens.