Here is a simple Winter bird feeder from an old bottle, and the same plastic that can then be recycled. We fill the seeds (bird food) into an empty bottle, fix the 3d model of the feeder on the bottle with a screed, or a rope, or a piece of wire. We turn it over and it's done, there is a hole in the back of the model for mounting on a pole or tree, as well as with a rope, wire or screed.