<i id='C59F721270'><strike id='C59F721270'><tt id='C59F721270'><small draggable="0bca47"></small><sup dropzone="c136ad"></sup><time date-time="691025"></time><pre date-time="2b212a" id='C59F721270'></pre></tt></strike></i> By Helen Briggs and Victoria Gill for BBC News
A humpback whale. Photo: konart/123RF
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