Several species of ants have a special symbiotic relationship with aphids. Aphids feed primarily on the sap from plants and secrete a liquid called honeydew. This secretion is very sugar-rich, and quite favored by ants as a food source. In return, ants protect the aphids against various natural enemies and improve the hygiene of the aphid colony. *Printable high-quality (Digital JPEG file) *16*24 inches