My boyfriend and I recently returned from a week long vacation. When we came home we began noticing giant black houseflies everywhere.
The are huge, and it seems like every time we get rid of one, another 3 appear out of nowhere. What the heck is going on here? They are really freaking me out. What can I do bout them?
You (or your boyfriend) must have left some organic matter, probably in the garbage can, and a single female fly laid her eggs. If it was warm, they matured quickly. There is not much you can do about the current brood but swat them. Just make sure there is nothing rotting in the house to provide food for a future generation.