The shape of the wader shown in plate 69 (repeated here), with its moderately long bill and legs, immediately suggests one of the Tringa species. The Calidris waders are more compactly built, and, except for juvenile Sanderling C. alba, lack the spotted plumage of the mystery bird. The extensive white spots of juvenile Sanderlings, however, give them a chequered rather than a spotted appearance; t

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