# Where are all these f'ing flies coming from?

**URL:** <https://boards.straightdope.com/t/where-are-all-these-fing-flies-coming-from/1022565>\
**Category:** In My Humble Opinion\
**Created:** [August 28, 2025, 10:31pm UTC](https://boards.straightdope.com/t/where-are-all-these-fing-flies-coming-from/1022565 "2025-08-28T22:31:27Z")\
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**Author:** ![commasense](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/commasense/32/3017_2.png) [@commasense](https://boards.straightdope.com/u/commasense)\
**Post date:** [August 28, 2025, 10:31pm UTC](https://boards.straightdope.com/t/where-are-all-these-fing-flies-coming-from/1022565/1 "2025-08-28T22:31:27Z")

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Yesterday we had an explosion of flies emerge, probably from the downstairs bathroom, which at one point had about 20 flies. They spread through the house, most of them rather slow and stupid and easy to kill. But we killed at least 50, perhaps more, using swatters and sticky traps.

We seem to have gotten the upper hand, but there are still a few popping up.

This has happened a few times before, but on a much smaller scale. It usually ends after a few days. It may happen that way this time, too, Og willing.

We’ve called a local exterminator, but haven’t heard back from him yet.

Any idea where they can all be coming from, what we can do to prevent these explosions, and how best to kill them?

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