Wrap the produce bag tightly around the nesting materials–this brings all the materials to the mesh, so that the birds can easily pick and choose–and secure it shut with a rubber band, or, if using that plastic bag has been killing you so far, go ahead and treat yourself by tying it off with a nice piece of twine or yarn, instead.
Notice that my girls have filled one bag with natural materials, such as grass, wool fleece, cornhusks leftover from our corn husk dolls, human hair, cat fur, and small twigs. Their other bag is filled with man-made items, such as polyester batting, thread, yarn, strips from plastic bags, beading wire, and dental floss. Can you guess what their science experiment is?
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This is all great stuff. I think the mesh bags are fine to use. We use them in the UK for lots of different bird foods and never had a problem with birds getting trapped before. Plus recycling these mesh bags is a good idea (we cant recycle here).
thank you for the ideas and inspiration!