The Guardian | Deepwater Horizon oil spill killed large numbers of dolphins, study suggests The Guardian One in five dead dolphins from within the oil spill zone, but only 2% of those from other areas, also had signs of severe lung damage caused by pneumonia. US lead scientist Dr Stephanie Venn-Watson, from the National Marine Mammal Foundation in San ... Record dolphin die-off linked to BP oil spill Study: BP Oil Spill Led to Biggest Gulf Dolphin Die-Off Recorded Dolphin Deaths in Gulf of Mexico Linked to Deepwater Horizon Oil Spill |