According to Wikipedia flies have a mobile head, with a pair of large compound eyes, and mouthparts designed for piercing and sucking (mosquitoes, black flies and robber flies), or for lapping and sucking in the other groups. Their wing arrangement gives them great maneuverability in flight, and claws and pads on their feet enable them to cling to smooth surfaces. Flies undergo complete metamorphosis; the eggs are laid on the larval food-source and the larvae, which lack true limbs, develop in a protected environment, often inside their source of their food. The pupa is a tough capsule from which the adult emerges when ready to do so; flies mostly have short lives as adults.
But to me they are just PEST.
Here are ways to get rid of them:
- Use a shallow dish bowl and fill it with an inch of apple cider vinegar and a tablespoon of sugar.
- Next, add some fruit-scented dish soap.
- You can leave the dish uncovered or tightly covered with plastic wrap. Make sure to poke a few holes in it to attract the flies.
Sugar Water Method:
Just find a jar, some sugar water and a paper funnel. Pour the sugar water into the jar and then put the funnel, wide side up, in the top of the jar. The flies will smell the liquid, be attracted to its sweet scent and fly into the jar via the funnel. Once in, they won’t be able to figure out how to fly out.
Keep your yard clean. Flies are attracted to any strong smell; if you eliminate the odors, you’ll drastically reduce the fly population outside your home. Pick up dog feces. Make sure you put it in sealable bags before you put it in the trash can.
Keep dumpster areas as clean and as far from the home as possible.
Use tight-fitting lids, and clean trash bins regularly. If plastic bags are used, ensure they are well sealed.
Eliminate areas of pooling, stagnate water, and other excessive moisture around the yard.
Insecticide fly baits can be put out in small bait stations to attract and kill flies. This can be particularly effective in dumpster areas if proper sanitation is followed. Always keep baits, and other pesticides, away from possible contact with children, pets, and non-target wildlife.