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We want to protect our bird seed from parakeets and young squirrels, which eat everything we put out. The bird table is already protected by galvanised mesh with a 5mm aperture, but the squirrel gets through that. The squirrel-proof seed feeder keeps the squirrel out, but the parakeets have worked out how to defeat the spring-loaded mechanism. What is the smallest size aperture of mesh we can use to keep the marauders out whilst letting in the robins, tits, dunnocks and goldfinches we love watching?