New York (dpa) - Tens of thousands of dead birds were washed up on the US west coast and in Alaska between mid-2015 and early 2016. Now researchers have found the reason for the mass extinction among the guillotine lumens: lack of food due to high sea temperatures. From 2014 to 2016, there was a large accumulation of unusually warm sea water in the Pacific off the coast, the researchers report in the journal “PLOS ONE”. The team used numerous sources to determine the extent of the mass extinction in detail.