Nestmate transport in Oecophylla longinoda weaver ants: a major gives a lift to a minor worker. This form of transport is thought to be more energy efficient than if both ants were to walk individually. St. Lucia, KZN, South Africa

Oecophylla longinoda patrol a tree trunk. St. Lucia, KZN, South Africa

Formica obscuripes nestmate workers engaging in trophallaxis, or the social sharing of liquid food. Wisconsin, USA