I bought some chains because birds keep banging on windows. Here are some of my favorites. I think because they're mostly "round" without a lot of fun shapes sticking out (like wings, tendrils, and the like), they last better/longer. They're all pretty much the same size too, compared to the fun big ones and a whole bunch of tiny tiny ones you can try to peel off and use (which might not help much when warning birds anyway). My only comment is that personally I'd rather see everyone neutral to happy than a few angry faces.
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