New study shows that the current concentrations of PCBs in the oceans are threatening the world's population of killer whales

(Natural News) Killer whales, or orcas, are one of the most widespread mammals on our planet, living in oceans from pole to pole. Part of the dolphin family, they are extremely social and smart creatures. Sadly, these enormous predators may one day be wiped off the face of the earth, however, thanks to pollution from...

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