Flies Flies are a remarkably diverse set of insects and they play important biological roles. They are important pollinators and decomposers. Peacock Fly These small picture-winged flies are fascinating–holding their wings above their backs. Tachnid Fly Tachnid flies are important pollinators, and they seem to prefer white flowers in our garden. Transverse Banded Drone Fly This is a hoverfly that feeds on nectar in flowers.