<i id='0892935BC7'><strike id='0892935BC7'><tt id='0892935BC7'><small date-time="951373"></small><sup dir="be72fd"></sup><time lang="7a1826"></time><pre date-time="708c32" id='0892935BC7'></pre></tt></strike></i> By Helen Briggs and Victoria Gill for BBC News
A humpback whale. Photo: konart/123RF
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