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Old 05-17-2016, 03:12 PM
Fridgemagnet Fridgemagnet is offline
Join Date: Feb 2005
Location: Hampshire, UK
Posts: 626
I once had something squatting in my attic, as evidenced by the scratching noises coming from the ceiling. I installed some humane catch-and-release mouse traps, but nothing took the peanut butter bait. Then one day I was up in the attic and I got buzzed by a blackbird. Further investigation revealed it had gained entry through a rotten soffit vent and nested in the eaves. I had a summer of being woken up early every morning by hungry chick noises (the nest was right above my bedroom window), but by the autumn the fledglings and parents moved out and I was able to repair the vents.

tl;dr: might be birds.