Friend or foe? Two Monomorium pharaonis worker ants briefly touch antennae along a pheromone trail. Icononzo, Tolima, Colombia
A busy trail of Monomorium pharaonis pharaoh ants. This species is now among the most pesty house-inhabitating ants worldwide. Icononzo, Tolima, Colombia
Neivamyrmex melanocephalus army ants initiating a live-ant bridge with their own bodies. Here two ants lean against each other while a third starts to climb. Sycamore Canyon, Arizona, USA