Cephalotes rohweri - Turtle Ant
Arboreal ants of the genus Cephalotes inhabit pre-existing cavities drilled into wood by other insects. Breaking open a dead branch on a Palo Verde tree reveals a colony in an old beetle hole. Notice the size and shape difference between the major (left) and minor workers. The majors use their large heads to block the nest entrance.
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This image was captured with a Canon EOS 20D, using a Canon MP-E 65mm 1-5x macro lens.