What distinct feature do flies possess compared to other types of insects?

Flies are classified in the order Diptera, which means "two wings" in Latin. A distinct characteristic of flies is that they possess only one pair of functional wings. This adaptation allows them to be very maneuverable in flight, as they utilize their halteres—modified hindwings that act as balance organs to help stabilize their flight. The unique wing structure is a defining trait that sets them apart from many other insect groups, which typically have two pairs of wings. This specificity of wing structure is crucial for their classification and behavior compared to insects that have different wing configurations.