Death in dolphins: do they understand they are mortal? /via New Scientist https://web.archive.org/web/20110905230026/http://www.newscientist.com/article/mg21128283.700-death-in-dolphins-do-they-understand-they-are-mortal.html
Death in dolphins: do they understand they are mortal? /via New Scientist https://web.archive.org/web/20110905230026/http://www.newscientist.com/article/mg21128283.700-death-in-dolphins-do-they-understand-they-are-mortal.html