<i id='BC7EAB4005'><strike id='BC7EAB4005'><tt id='BC7EAB4005'><map dir="460aa4"></map><bdo lang="dc223c"></bdo><dfn draggable="50665b"></dfn><pre date-time="512915" id='BC7EAB4005'></pre></tt></strike></i> By Helen Briggs and Victoria Gill for BBC News
A humpback whale. Photo: konart/123RF
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