<i id='B5C6232509'><strike id='B5C6232509'><tt id='B5C6232509'><map date-time="caa4a7"></map><bdo dir="a815b2"></bdo><dfn lang="b7b64f"></dfn><pre date-time="51f196" id='B5C6232509'></pre></tt></strike></i> By Helen Briggs and Victoria Gill for BBC News
A humpback whale. Photo: konart/123RF
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