It has a clever arrangement inside to hold seed on several levels and can support more finches than the full sock and many more than a half empty sock (even when it is less than half full).
We regularly have a dozen or more goldfinches at one time and sometimes they will all fight for this feeder and other times they seem to ignore it altogether in favor of the larger feeder with mixed nuts and seeds. So far, any explanation for their shifting preferences is lost on me.
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