Contrary to popular belief, American Robins don’t find earthworms by hearing or smelling them. Robins find earthworms by cocking their head to one side, independently using each eye to look for visible signs of worms.
Worms only make up about 15%-20% of the summer diet for American Robins. The rest of the diet is made up of other insects, fruit, nuts, and berries. So don't be surprised if you see them under your feeder looking for an overlooked peanut.
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