Methods of distinguishing first-year and adult Shelducks in the field.--The separation of first-year and adult Shelducks Tadorna tadorna in the field has long been very conjectural and there is still a tendency to describe almost any spring or summer flock as non-breed ing, regardless of the gregarious tendencies of breeding adults. My recent study of the Shelduck in Kent (Ibis, 106: 33 3-360) has...

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