Large numbers of bottlenose dolphins have been washing up on the shores of Louisiana, Mississippi, and Alabama since the 2010 Deepwater Horizon oil spill, the largest spill to take place in US waters. While it seems like it should be a safe assumption to link the spill to the dolphins' deaths, there's been a holdup: the dolphins actually started washing up in elevated levels two months before the spill, potentially because of a cold winter.
Dolphin deaths in Gulf of Mexico linked to Deepwater Horizon oil spill
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