GULF SPILL: Deepwater Horizon disaster killed 800,000 birds -- studies Published: Tuesday, May 6, 2014 The 2010 Deepwater Horizon oil spill killed hundreds of thousands of birds, two studies show. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.