About 70 creatures found washed up on coast of North America but federal agency believes it is a small fraction of total fatalities
US government scientists have launched an investigation what has caused the deaths of an unusually high number of gray whales found washed up on the west coast of North America.
About 70 whales have been found dead so far this year on the coasts of California, Oregon, Washington and Alaska, the most since 2000. About five more have been discovered on British Columbia beaches.
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