Arctic terns breed around the Arctic and temperate northern parts of the northern Hemisphere. They travel massive distances to overwinter in the Southern Ocean and Antarctica (4). The population that breeds in Britain and Ireland is at the southern-most limit of its breeding range. This range extends through Greenland and Iceland, along the Baltic and Scandinavian coasts reaching into Siberia. Most of the British breeding population occurs in Scotland, Orkney, Shetland and the Hebrides. Populations also occur in England in the northwest and northeast and there are small numbers in Norfolk and around the southern coast; they also breed in Anglesey in Wales (4).
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