In 2009, two out of three killer whales died after spending three weeks in Alaska's freshwater Nushagak River, apparently succumbing to stresses of being out of a saltwater environment. NOAA (National Oceanic and Atmospheric Administration) Fisheries biologists explain:
http://m.mnn.com/earth-matters/animals/stories/2-alaska-killer-whales-dead-after-swimming-in-river
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