The Fly (1986) is a horror-science fiction film directed by David Cronenberg. It follows the story of a scientist, Seth Brundle, who accidentally merges with a fly during a teleportation experiment. As the experiment progresses, Seth's body begins to mutate and he slowly
From Wikipedia
A fly is an insect of the order Diptera, named for the single pair of wings. The hindwings have evolved into halteres, organs that sense rotation, giving flies precise control of their flight. Diptera is a large order containing more than 150,000 species, including horse-flies, crane flies, hoverflies, mosquitoes and others.