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A soldier Eciton burchellii army ant. The ice-tong shaped mandibles defend the colony against vertebrate predators. Captive colony at the California Academy of Sciences
Orectognathus versicolor is unusual for a trap-jaw ant in having a major worker caste (the large ant at center). The function of majors in this species remains unknown; other Orectognathus lack majors. Brisbane, Queensland, Australia
Orectognathus versicolor is unusual for a trap-jaw ant in having a major worker caste (the large ant at center). The function of majors in this species remains unknown; other Orectognathus lack majors. Brisbane, Queensland, Australia
Orectognathus versicolor is unusual for a trap-jaw ant in having a major worker caste (the large ant at center). The function of majors in this species remains unknown; other Orectognathus lack majors. Brisbane, Queensland, Australia
Orectognathus versicolor, minor and major workers in the nest. Brisbane, Queensland, Australia
A soldier Eciton burchellii army ant. The ice-tong shaped mandibles defend the colony against vertebrate predators. Captive colony at the California Academy of Sciences
Colonies of the giant neotropical army ant Eciton burchelli have workers of many different sizes specialized for different tasks. The large, light-colored ant at center is a soldier that performs defensive functions, the smaller ants are minor workers that specialize in prey capture. Captive colony at the California Academy of Sciences
Camponotus sansabeanus - worker ants vary in size, color, and body proportion. Mojave National Preserve, California, USA
Camponotus sansabeanus - worker ants vary in size, color, and body proportion. Mojave National Preserve, California, USA
Orectognathus versicolor is unusual for a trap-jaw ant in having a major worker caste (the large ant at center). The function of majors in this species remains unknown; other Orectognathus lack majors.

Brisbane, Queensland, Australia
Orectognathus versicolor is unusual for a trap-jaw ant in having a major worker caste (the large ant at center). The function of majors in this species remains unknown; other Orectognathus lack majors. Brisbane, Queensland, Australia
Orectognathus versicolor is unusual for a trap-jaw ant in having a major worker caste (the large ant at center). The function of majors in this species remains unknown; other Orectognathus lack majors.

Brisbane, Queensland, Australia
See photo in original gallery.
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all images and text © Alex Wild 2001-2013