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I fastened chicken wire mesh on top of the feeding surfaces (see photo) in the hope that birds will be able to peck the seed through it, but the squirrels won't be able to get at the seeds.
A pigeon must have been watching when I refilled the bird seed and is feeding as I write this.
Now I must wait for a squirrel!
(Apologies. I can rotate the picture on my computer, but whenever I add it to this message the web site turns it on its side again. Try lying down on your left side to view your computer screen!)