An orca that was found dead last year is now considered one of the most polluted whales ever found: The marine animal contained some of the highest levels of polychlorinated biphenyls (PCBs) — human-made organic chemicals known to cause a variety of adverse health effects — ever recorded. Lulu, an adult female killer whale, was a member of the last orca pod living near the United Kingdom. When the dead whale was discovered in January 2016 on the Isle of Tiree, Scotland, after becoming entangled in fishing rope, researchers analyzed...
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