I want to keep larger birds away from my goldfinch feeder. How high & wide should the holes in the cage be?
I want to build a cage around my goldfinch feeder in order to keep out sparrows, house finches, chickadees, etc. I know that goldfinches are like 5 inches long, but none of the bird sites tell how tall upright the bird is (or even how wide its body is, for that matter). That's why I have no idea how tall or wide the spaces between the bars should be. Please help. I will vote the first answer with the exact measurements needed as the best answer, earning you of course 10 points.
I found plans for a goldfinch house that calls for a 1 1/2" entry hole. I think 1 1/4" would be big enough.
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