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

Pheidole morrisi is a common soil-nesting ant in sandy habitats in southeastern North America. This photo shows a major (left) and minor worker from the same colony. Orlando, Florida, USA