On a cold spring day, harvester ants cluster around their nest entrance to warm up in the sun before heading out to forage. Frank Raines State Park, California, USA
Lasius (Acanthomyops) claviger citronella ants. The different colors of the workers reflect their age. Ants are pale in color when they first eclose from the pupal stage but darken over time. Vermillion River Observatory, Illinois, USA
Cerapachys (antennatus-group) worker. Danum Valley Field Centre, Sabah Borneo
