I was cleaning off the garage roof today and wondering why it had so much coarse sand on it. It was directly beneath the crows that roosted here last winter. I looked it up and crows eat large amounts of sand and gravel for digestion, and unlike many birds that retain it till it's worn out, they eject it constantly. So the sand is a feature of crow roosts.
They arived last October and I finally convinced them to move along sometime in December. They went down along the railroad tracks for the rest of the winter. I hope they liked it down there.
I also learned one of their favorite berries is poison ivy, so they spread the seeds of course.
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