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Recently saw a documentary on PBS about Orca Whales— Their bodies are so full of high PCB levels that a washed up dead one needs to be treated as hazardous waste.
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A large number of the breeding adult males have died due to the effects of the PCBs, whereas the adult famales have not been so largely effected because the PCBs are fat soluble... So the nursing mother Orcas are able to rid their bodies of some of the pollutant through their milk.
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But the those PCBs are being passed on through the milk to the calves. Many of the calves never reach maturity now because the PCBs severely debilitates their immune systems. Along with that, the PCBs cause malformed reproductive systems in many of the calves that do reach maturity.
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All combined, a quagmire that is threatening the future of the species.
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Photo above from August 14, 2008 Seattle Times article, Newborn orca spotted in the San Juans
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PCB INFO LINK
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