Image credit Gary
After years of cleaning out nest boxes and seeing the wide variety of materials used, I decided to assist by providing short pieces of binder twine, unraveled down to the individual threads.
That's the binder twine in the foreground of the shot above, held down by a railroad spike, but easily pulled out by a determined bird.
[Note: please excuse my disgusting-looking coffee cup; I was dunking a biscotti, which left junk in the mug.]
From my Birdcam
From my Birdcam
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