Position the stick so it holds up the box in a way that causes the box to be angled off the ground. Place the seeds under this angled box, with a few outside the box for visibility. Attach the string to the stick, unwind it to a hidden location, and wait for the cardinals.
Once the bird is secured pick only the tomatoes that match his color. If you find that your tomatoes are rather hard and tasteless it is very possible you’ve caught the female of the species.
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