What will keep invasive sparrows out of birdhouses intended for native finches, wrens, and bluebirds? - Quora

Answer (1 of 6): There are ways, Shigeki, but none of them are totally effective. Food is an important factor. Feed only Nyjer, Safflower, suet, fruit or nuts because sparrows don’t like them. A mesh feeder that requires the bird to cling to it is good for the seeds, or socks. No platform feeders

What will keep invasive sparrows out of birdhouses intended for native finches, wrens, and bluebirds? - Quora

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How to remove and discourage invasive house sparrows so that native birds can safely flock to my yard - Quora