Neivamyrmex opacithorax. Army ants carrying brood. Notice how the ants carry their pupae, slung under their bellies in typical army-ant style. Chiricahua Mountains, Arizona, USA

Oecophylla smaragdina, the green tree ant of northern Australia. Cape York Peninsula, Queensland, Australia

Friend or Foe? Oecophylla longinoda workers encounter each other on a tree branch and take a quick sniff of the other's scent. St. Lucia, KZN, South Africa