Eciton burchellii set up bivouacs by linking their bodies together. Here, one worker serves as an anchor for several others. Maquipucuna reserve, Pichincha, Ecuador
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
