A nest of the miniature predator Pyramica rostrata in an Illinois forest. Notice how the ants have enclosed their space by building a circular wall around the colony. Vermillion River Observatory, Illinois, USA
Several species of arboreal plants, including orchids, bromeliads, and cacti, live together in an "ant garden" tended by fierce Azteca ants. The ants construct a carton matrix to house the plants' roots and their own brood. Barton Creek, Cayo District, Belize.
