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Foraging behaviour in birds co-varies with bill morphology. Shorebirds exhibit pronounced inter-and intra-specific variation in bill length and shape as well as in foraging behaviour. Pecking, or feeding on epifaunal intertidal invertebrates, is associated with a straight bill, while probing, feeding on infaunal prey, is facilitated by bill curvature. Here, we used high resolution microscopy to study gross bill morphology of Western Sandpipers (Calidris mauri). We showed that bills of males anddoi:10.1163/1570756054472818 fatcat:5edpc4iucvfw3gfwk37lf3dd4u