Formica montana tending Publilia treehopper nymphs for honeydew. Lake Forest, Illinois, USA
A Nylanderia worker tends to a scale insect for honeydew. Morretes, Paraná, Brazil
Podomyrma adelaidae tends to a Lycaenid caterpillar. These caterpillars secrete substances that the ants find attractive, and the ants in turn provide protection from parasites. Poochera, South Australia