<i id='5244CED02A'><strike id='5244CED02A'><tt id='5244CED02A'><area date-time="27402f"></area><map dir="098130"></map><bdo lang="d1153b"></bdo><pre date-time="7d75ae" id='5244CED02A'></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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