Who’s Knocking?
It started recently and maybe you’ve noticed, maybe not. There’s a very audible “knocking” sound that seems to go on and on sometimes for several minutes at a time. The sound may be very close by, it may be deep in the woods, sometimes from multiple locations. It sounds like two pieces of wood rhythmically making contact. I’m embarrassed to say it took me awhile to figure this little mystery out. My initial thought was it’s a bird. The Yellow-billed Cuckoo, a bird that I hear regularly throughout the summer, makes a clucking sound yet it is distinctly different than the knocking I was hearing. And as I was hearing this knocking well into October and November it did not make sense that it would be a Yellow-billed Cuckoo as they migrate back to S. America in the fall. One day as I was working in the yard the knocking began right in my backyard. I grabbed my binoculars that I keep close and stalked into position to catch the culprit making the sound. It was a chipmunk.
Most information I could find on this behavior referred to the sound as a warning to other chipmunks that danger is present, like a hawk for example. It may very well be the sound is also being used to stake claims on certain areas. In the fall as chipmunks begin to gather food for the long winter they become highly territorial. The work of gathering and storing food can mean life or death for them. Turf wars begin and it’s every chipmunk for him or herself. Chipmunks do not hibernate but may stay in their dens for long periods of time only coming out briefly when temperatures are conducive to gathering extra supplies. They may even go into torpor, a slowed-down state, to conserve energy.
So if you have heard and wondered about the knocking sound you hear this time of year it’s the eastern chipmunk.
Many of us still have hummingbirds although their numbers are dwindling. Remember, there is not a time that you should take your feeders down. Hummingbirds will continue to move through middle-Tn during the month of October. Keeping at least one feeder available can be of great help to these tiny travelers.
Keep your eyes on your birdbaths as weary warblers look for water sources during migration. You just may be treated to one of the many beautiful species of warblers bathing and drinking in your yard.