Greenpeace activists entered Syncrude’s Aurora North Tar Sands facility earlier today, erecting a banner that transformed the opening of a tailings pond pipe into the “mouth” of a giant skull, spewing toxic sludge into the same tailings pond that earlier this year killed 500 migrating ducks. Activists also deployed a massive banner reading “World’s Dirtiest Oil: Stop the Tar Sands.” A third group of activists attempted to block another pipe to prevent further toxic contamination of Alberta’s environment, but were intercepted by Syncrude security before they could completely block the pipe.