hmm. the crow family is behaving as if something in this area--the area of my porch, and the grass/tree area around it--frightened them; they're being a lot more wary and avoidant than they were a few days ago. I would attribute this to the loss of one of their fledglings, except that happened over a week ago, and they were behaving just as usual then. I wish I could ask them--or better still, convince them that my porch and Cheerios/peanuts are still safe. :\