Over 2,000 gray whales have turned up dead off the Pacific coast, timed to three unexplained mass die-off events — and scientists now believe they know why.Back in 1986, Gray whale populations had made an impressive comeback from the brink of extinction, after the International Whaling Commission issued on an all-out ban on commercial whaling.But researchers have since tracked a series of new and more mysterious mass deaths of the majestic sea mammals — including an ongoing wave of research that has linked them to .
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