Overcast and cool. A pileated woodpecker flies into the dead top of the tallest black locust in the yard, seemingly oblivious to a swirling conflict between a small flock of local jays and two migrant sharp-shinned hawks. A slow inspection of the treetop turns up nothing worth tapping for, and she flies off, leaving the tree to the jays.

Sunny and cool at midmorning, with the smell of woodsmoke drifing up from the valley. The bluejay who stumps the bird app is making his one-of-a-kind call — almost a croon. At random moments, black walnuts drop onto the driveway with a thud.

Heavily overcast: a rain sky with no rain. Up in the woods, a Cooper’s hawk begins to chirp, answered seconds later by a red-tailed hawk. The two hawks exchange calls for several minutes before falling silent and letting the jays take over.