Over the past 100 years, 36 million birds have been fitted with unique numbered rings, allowing scientists at the BTO to learn more about their movements.The BTO’s head of ringing, Jacquie Clark, said: “As a result of ringing we have learned a lot but there is still a lot we don’t know and we look forward to the next 100 years.”

Bird Ringing: A Concise Guide costs £7.50 plus p&p. To order a copy, visit www.bto.org or tel 01842 750050.

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