efferia robber fly resting on a rocky surface in colorado with a leafhopper (leaf hopper cicadellidae) as prey

animal arthropod background behavior biodiversity biological bug cicadellidae classification close colorado diptera ecology efferia extended family fauna fly genus history hopper insect invertebrate kingdom leaf legs lichen macro mountains natural nature observation order predator prey rest resting robberflies rock rocky scientific species study surface taxonomy textured wild wildfly wildlife wings world