I knew it wasn't a serious article. I just couldn't figure out what they were up too at first. I was fooled in the sense that for a moment I thought that the editorial staff of Nature magazine was replaced by the producers of the History Channel.
I recall that Nature did it before when the publication date of an issue came at the first day of the fourth month. I also recall that in 1985, Nature published on unnumbered pages an article "The Perpetuum Mobile Is Discovered" by Stefan Marinov. This was not an April fool piece but a paid ad. Here is a comment from the Feedback column in New Scientist (3 October 1985, page 66):
Action/thriller author Matthew Reilly's latest book The Great Zoo of China plot revolved around the idea that dragons did exist and have been hibernating for the last thousand years or so because the global temperature was too cold, but now its warming up they have started to emerge. China of course has built a Jurassic Park style zoo to keep them but shit goes awry.
But thats just bombastic non-fiction.
Got to hand it to Nature and the odd witty prank, proof that us scientists have a sense of humour too!