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The author also made use of many texts in the production of this page and the linked pages and would recommend for further reading:
Hilbre Island Observatory Report Obtainable from Deeside Naturalists Society Clwyd Bird Report See Local Organisations. The RSPB Guide to Birdwatching in Clwyd Published by the RSPB in association with Clwyd County Council. A modestly priced but indispensible guide. ISBN 0 903138 32 8 The Atlas of British Birdlife By Bob Scott ISBN 0 86363 030 8