Cut an empty, plastic milk jug in half, width wise, using a pen knife. Discard the top half of the milk jug. This bottom half of the milk jug will become a pagoda bird feeder.
Sand the cut edges of the milk jug half using fine-grain sandpaper to remove any sharp or jagged edges. Use small, circular motions with the sandpaper.
Poke a hole in the middle of each side using a nail. Position each hole so that it is 1 inch below the top edge. Sand the inside of each side where the hole was poked out to remove any jaggedness.
Wipe off the milk jug half using a washcloth to remove any plastic material left behind from the sanding.
Cut four pieces of twine to measure 12 inches long each. Tie a piece of twine through each hole of the milk jug half, then tie the other ends of the twine pieces together.
Fill the milk jug pagoda bird feeder with 4 cups of bird seeds, then hang it up by the twine.