Insects clean themselves by rubbing their bodies and legs together. This is a necessary part of their daily lives, as they need to eliminate dirt to land on a surface and find food. Flies also need to maintain hygiene to protect themselves against predators. For this reason, they spend a great deal of time cleaning themselves.
Flies also take pride in their appearance. They are prone to congregate in areas with excessive dirt. Therefore, they must keep their bodies and hairs clean to maintain their sense organs and fly. This also makes it easier to find a mate. While the answer to the question is not completely understood, it does point to a common human behavior that flies share.
Moreover, flies can spend up to 20 minutes cleaning themselves, despite only having their legs and head to do so. The first move is to clean the head, followed by the body and legs. Eventually, the cleaning process moves to lower priority parts. The process has a hierarchy of neural circuits, which makes it possible to identify the critical neural circuits for grooming.
In addition to cleaning their bodies, flies have soft mouths, which means that they don’t bite people. They feed on sweat, dead skin, sugars, and protein. Although houseflies can feed on livestock, they prefer to feed on human skin. Their scent, carbon dioxide, and moisture attract them to human bodies.