The variety of bill sizes and shapes among the sandpipers is astounding! Many sandpipers have sensitive nerve receptors in their bill tips, so they can find unseen prey through touch, odor, and pressure changes. Those sandpipers with long, straight bills — like the Long-billed Dowitcher — are often described as "stitching." As the bird probes for food, its beak moves rapidly up and down, like the needle on a sewing machine.
More info and transcript at BirdNote.org.
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