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I LOVE this idea for bird watching, but I had something like this and the male cardinal got very territorial against his reflection. He slammed against the glass daily for several months.
Interesting! We don't have cardinals in Oregon - I wonder what birds would show up?
How do u make that
Great Bird Feeder!
bird feeder made of glass
glass bird feeder www.etsy.com/...
need a bird feeder
Glass bird feeder
How To Make A Simple Window DIY Bird Feeder | Shelterness