Since 1948, the barren Nemegt area of Mongolia's Gobi Desert has been a fossil hunter's nirvana. Bones from thousands of dinosaurs and other creatures that roamed the shores of an ancient river 83 million to 65 million years ago have been dug up.But in 2001 Canadian and Mongolian researchers led by Phil Currie of the Royal Tyrrell Museum of Paleontology were startled to discover "fossilized footprints." And there weren't just one or two footprints, scientifically known as ichnites. You could see where one dinosaur had stepped in the track of another and where one dinosaur had stepped on the head of another after death.In an October paper in the journal Ichnos describing their findings, the scientists reflect that an astounding thing about the embarrassment of footprint riches was that none of the previous expeditions had noticed them even though they were everywhere you looked."Some of the footprints were literally 10 metres from our tent. Another was walked by every day, with some people going to one side and another to the other," Dr. Currie says. "But it wasn't just us. Russian, Poles, Bulgarians, Americans, Canadians, Chinese and Mongolians all had gone into that site and nobody had ever seen them."