December 10, 2018
As I stepped outside to begin my morning trail walk, the first sound I heard was a calling red-headed woodpecker. The call came from a black locust stand at the northwest corner of my 3.7-acre rural property. The last time I had heard such a call, sounding like a short trill or “qrrr,” was ten days before, when I nervously watched a ¼-mile-wide tornado slowly moving northward along the Illinois River valley about seven miles to the west. Over the years, I have learned to interpret the “qrrr” call as either a low level territorial warning or a serious alarm, depending upon its intensity and volume. This call only seemed a bit agitated. So I continued on my walk and forgot about the calling red-headed woodpecker.
About fifteen minutes later, as I approached the black locust stand, I heard the loud, harsh alarm call of a northern mockingbird. When I looked upward, a barred owl crossed my field of view just below the tree canopy; it flew only a short distance, though, before landing at the top of a black locust tree. The mockingbird was immediately on the owl, calling and jumping from branch to branch. The owl, of course, seemed bored, slowly turned its head and stared directly at me. In a few seconds, two red-headed woodpeckers appeared, excitedly uttering their “qrrr” alarm calls at peak volume; they joined the mockingbird mobbing the owl, but also seemed to be distressed with each other. Over the last few weeks, I was aware of only a single red-headed woodpecker overwintering territory, but I now suspected that the owl was perching in a tree near the boundary of two territories. Red-headed woodpeckers store mast (acorns, for example) for the winter in caches usually placed in standing dead trees; and while mobbing the owl, each was drawn away from protecting its cache, which then would have been vulnerable to plunder by squirrels and other birds such as red-bellied woodpeckers and gangs of blue jays that are never far away.
Woodpecker hole in black locust snag, likely with a cache of acorns
So I was not surprised when several blue jays soon formed an uneasy alliance with the woodpeckers to continue harassing the barred owl, who calmly looked around a bit, but was definitely more interested in keeping its eyes on me. The added attention, though, must have been too much, so the owl flew toward a larger tract of woods on the neighboring property. With the owl gone, all of the mobbing birds rapidly disappeared into the background. A gentle breeze once again became the loudest sound. And I thought back nineteen years to a conversation I had with a conservation-minded friend just after I had purchased this property, who said, “The first thing I would do is cut down all those invasive black locust trees.” I am certainly glad that I did not listen.
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