Eciton burchellii has one of the more complex caste systems among ants, with at least four distinct types of worker. Here, a media worker (at left ) passes a soldier. Jatun Sacha reserve, Napo, Ecuador
Eciton burchellii soldier. The bizarre globular eyes of army ants are a result of the ants' having re-evolved functional lenses from the vestiges of a blind ancestor. Maquipucuna reserve, Pichincha, Ecuador
Eciton burchellii soldier standing guard at the edge of a trail. Maquipucuna reserve, Pichincha, Ecuador
