House flies are a common type of fly that are found worldwide. They are known for their quick movements and tendency to gather in large numbers. While they do not pose a direct threat to humans, they can carry and spread diseases, making them a potential health hazard. House flies are attracted to warm, moist environments and are most active during the day. They lay their eggs in decaying organic matter, such as animal feces or garbage, and the larvae feed on this material as they develop into adult flies. House flies are known to carry and spread diseases, such as salmonella, typhoid fever, and cholera, by contaminating food and surfaces with their feces.