A black-capped chickadee sounding enough like a house sparrow that BirdNET IDs it as one(just the first set of harsh calls):
https://www.inaturalist.org/observations/94732467
I’m not sure how unique it is, I hear it quite a bit at around me at certain times, but I haven’t heard it in others’ recordings yet.
Either that or a black walnut being chewed on by a squirrel, something else I hear a lot, but I find it to sound different from other chewing and nobody else has black walnut audio on iNat yet.
https://www.inaturalist.org/observations/97077903