Cephalotes pusillus - turtle ant, major worker. The deep recesses on the head (the "scrobes") allow the ant to fully retract her delicate antennae.

Carrancas, Minas Gerais, Brazil
Fighting ensues when both Acromyrmex disciger leafcutting ants and Pheidole vafra big-headed ants arrive at a cookie bait. Although the Pheidole won this particular fight, the larger battle went to the leafcutters, and within 20 minutes of taking this photo the Pheidole had vanished.

Morretes, Paraná, Brazil
When both Acromyrmex disciger leafcutting ants and Pheidole vafra big-headed ants arrive at a cookie bait I placed on the ground, fighting ensues. Although the Pheidole won this particular fight, the larger battle went to the leafcutters, and within 20 minutes of taking this photo the Pheidole had vanished.

Morretes, Paraná, Brazil
Cephalotes pusillus - turtle ant, major worker. The deep recesses on the head (the "scrobes") allow the ant to fully retract her delicate antennae.

Carrancas, Minas Gerais, Brazil
Myrmecologist Ricardo ("Bob") Solar ponders the sharp mandibles of an Atta laevigata soldier, the world's largest leafcutter ant. 

Carrancas, Minas Gerais, Brazil
When both Acromyrmex disciger leafcutting ants and Pheidole vafra big-headed ants arrive at a cookie bait I placed on the ground, fighting ensues. Although the Pheidole won this particular fight, the larger battle went to the leafcutters, and within 20 minutes of taking this photo the Pheidole had vanished.

Morretes, Paraná, Brazil
Pheidole sp. major worker, showing the massive head.

Maquipucuna reserve, Pichincha, Ecuador
Pheidole sp. major worker, showing the massive head.

Maquipucuna reserve, Pichincha, Ecuador
Cephalotes spinosus turtle ants nest in tree cavities carved by the larvae of wood-boring beetles. At the top, a pair of guard ants sit in the entrance, blocking the hole with their bulbous heads.

Misahuallí, Napo, Ecuador
Cephalotes spinosus turtle ants nest in tree cavities carved by the larvae of wood-boring beetles. At the top, a pair of guard ants sit in the entrance, blocking the hole with their bulbous heads.

Misahuallí, Napo, Ecuador
Cephalotes spinosus turtle ants nest in tree cavities carved by the larvae of wood-boring beetles. At the top, a pair of guard ants sit in the entrance, blocking the hole with their bulbous heads.

Misahuallí, Napo, Ecuador
Cephalotes spinosus turtle ants nest in tree cavities carved by the larvae of wood-boring beetles. At the top, a pair of guard ants sit in the entrance, blocking the hole with their bulbous heads.

Misahuallí, Napo, Ecuador
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all images and text © Alex Wild 2001-2013