"Killer whales are in deep trouble because of persistent chemical pollution in the environment, researchers say.
A new study suggests the long-term viability of more than half of the different orca groups around the globe is now in question.
Some populations, such as those around the UK, the Strait of Gibraltar, off Brazil, Japan and California, are almost certainly doomed. "
Jonathan Amos and Victoria Gill report for BBC News September 27, 2018.
Source: BBC News, 10/01/2018
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