<i id='0BAA73F183'><strike id='0BAA73F183'><tt id='0BAA73F183'><sup date-time="407367"></sup><time dir="3ab238"></time><tt lang="4b4c37"></tt><pre date-time="2a3459" id='0BAA73F183'></pre></tt></strike></i> By Helen Briggs and Victoria Gill for BBC News
A humpback whale. Photo: konart/123RF
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