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The aim of the project is to use Strontium isotopic ratios in bone and feather tissue to discriminate between the two races of redshank (Tringa totanus)that overwinter on Scottish estuaries. One race brittanica breeds in Scotland and the other, robusta breeds in Iceland. Preliminary results have shown there to be two distinct clusters of ratios for the two races enabling the racial identification of juvenile birds. It is planned to extend the study to develop other migratory tracing methods for shorebirds and wildfowl using European estuaries.