Food, but not as we know it

Ants engage in a symbiotic relationship with aphids, "farming" them for their sweet secretions called honeydew. Ants protect aphids from predators, herd them to the juiciest parts of plants, and even move them to new plants. In return, ants "milk" aphids by stroking their abdomens, coaxing them to produce honeydew, which they then consume.