Which is the most common fly species found in houses?

Yes they serve as part of the food chain for other insects but they are dirty horrible things that spread germs and disease.

I've seen butter fly, I've seen a house fly, but I never seen an elephant fly.

UnopposedYogi27101, for what purpose do they serve on earth other than spread germs and just plague the hell out of folk with their buzzing around especially when you are trying to have an outdoor meal on a summer's day!

Shoofly don’t bother me.

I like those stores that have a blower turn on as soon as the door opens. It keeps the flies from coming in.

Player #96919, Check Out Nature's Good Guys and buy some ladybugs to keep flies away! I do this to keep them out of Cats food. It works wonderfully.

All part of the circle of life....

yucky insect

Again uck