<i id='1776F6A02E'><strike id='1776F6A02E'><tt id='1776F6A02E'><small lang="5cde57"></small><sup draggable="c9fc04"></sup><time dropzone="ae0634"></time><pre date-time="6baddd" id='1776F6A02E'></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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