Eciton rapax has the largest workers of any Eciton species. These handsome insects are specialist predators on the brood of ponerine hunting ants. Jatun Sacha reserve, Napo, Ecuador

Eciton rapax lacks the distinct solider caste that marks most other species of Eciton, but it does show variation in worker size. Jatun Sacha reserve, Napo, Ecuador

Forelius mccooki workers taking nectar from a Cholla cactus in the Sonoran desert. Cacti provide nectar to attract ants, as some ant species help the plant by removing herbivorous insects. Tucson, Arizona, USA