Ants as earthbound creatures are not ideal pollinators, but they can carry pollen over short distances. Champaign, Illinois, USA
Orchids in the Mesoamerican and Caribbean genus Myrmecophila have hollow stems for housing ants. Orchid collection at Caves Branch Lodge, Armenia, Belize.
An epiphytic Myrmecodia ant-plant in an Australian woodland. The swollen base of this plant is hollow, with an intricate gallery of chambers that house aggressive Philidris ants. The ants defend the plant (not very effectively in this case, judging from the holes in the leaves), and provide the plant with nutrients. Iron Range National Park, Queensland, Australia