<i id='8997F445BD'><strike id='8997F445BD'><tt id='8997F445BD'><tt date-time="50acfc"></tt><var dir="69774a"></var><area lang="f92abd"></area><pre date-time="07c95a" id='8997F445BD'></pre></tt></strike></i> By Helen Briggs, environment correspondent for BBC News
One expert says we need to respect these "clever birds". Photo: Phil Smith
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