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the garden-roof coop: DIY Wine Bottle Bird-Feeders: Requires a drill bit, safety glasses, a fair amount of technique, and another person to spray keep the bit lubricate with water while you drill the bottle. May require several bottles for practice (and maybe work gloves).
10 Creative DIY Bird Feeders • A great round-up on DIY Bird Feeders from around the web with lots of Tutorials! Including this cool diy bird feeder made from a plate, bowl & some hardware from 'erins creative'.