In addition to the answers that some have posted, they may be after the [concrete mites](https://bygl.osu.edu/node/1588). Unless you’re close to the ground, you aren’t going to see them. We have them here in Ohio but I thought this was something that was everywhere. If I leave my garage door open in the summer, the finches will fly in and peck at the concrete. I assume that’s what they’re eating as there’s usually nothing else on the floor but sawdust.
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