The robber fly is a fascinating insect known for its hunting prowess, but did you know that it has several synonyms? Scientifically known as Asilidae, the robber fly is also called assassin flies, bee killers, and hanging thieves. These names reflect the insect's predatory behavior as it preys on other insects, including bees, wasps, and other flies, often catching them in mid-air. The name hanging thief refers to the robber fly's habit of hanging upside down from a perch and attacking passing prey, which it captures with its sharp mouthparts. Regardless of the name, the robber fly is an impressive hunter that plays an important role in controlling insect populations in the ecosystem.