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Numerous dead dried flies between two window frames on a dirty window sill with exfoliating paint, at the end of winter, in a town house. Photos | Adobe Stock
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Cluster Fly Control: How to Get Rid of Cluster Flies | DIY Cluster Fly Treatment Guide | Solutions Pest & Lawn
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They're so sneaky': New Zealand homeowners battle plague of smelly cluster flies | New Zealand | The Guardian
![I found these in my window frame in Germany. No bugs or anything crawling out of them, what are they? Can I just vacuum it away? : r/insects I found these in my window frame in Germany. No bugs or anything crawling out of them, what are they? Can I just vacuum it away? : r/insects](https://preview.redd.it/i-found-these-in-my-window-frame-in-germany-no-bugs-or-v0-6jvvkkwsvhla1.jpg?width=640&crop=smart&auto=webp&s=2bd69ce528764bef70214c241aa8d06b5c48150f)