A large Podomyrma gratiosa tree ant attacks a column of smaller Crematogaster workers that pass too close to her nest. The Crematogaster fight back, and even though the large size and heavy armor of the Podomyrma allow it a one-on-one advantage, the superior numbers of Crematogaster give the smaller ants the edge in this fight. Naracoorte, South Australia
Podomyrma sp. Mungkan Kandju National Park, Queensland, Australia
Colobopsis impressa is a small arboreal ant whose minor workers (right) mimic Crematogaster acrobat ants. The major workers (left) serve as living doors, plugging nest entrances with an enlarged head. Laboratory colony at the University of Central Florida, USA
