2. Eyes: The eyes of male flies are larger than the eyes of female flies. This is because male flies need to have a wider field of vision in order to find females.
3. Abdomen: The abdomen of a female fly is larger and more rounded than the abdomen of a male fly. This is because the abdomen of a female fly contains her eggs.
4. Wings: The wings of a male fly are longer and thinner than the wings of a female fly. This is because male flies need to be able to fly faster in order to catch females.
5. Body Color: The body color of a male fly is usually darker than the body color of a female fly. For example, male fruit flies are usually brown or black, while female fruit flies are yellow or brown.
6. Bristles: Male flies have more bristles on their bodies than female flies. This is because the bristles help the male fly to grip the female fly during mating.
7. Gynecophoric legs: In some species, male flies have elongated forelegs that are modified for grasping the female during mating. These modified forelegs are known as gynecophoric legs.
8. Genitalia: The genitalia of a male fly and female fly are clearly distinctive.