Join three leaders of a scientific expedition that led to one of the richest dinosaur discoveries in recent history. In 1997 a group of scientists traveled to Patagonia in Argentina to search for fossils of birds. Instead, they found themselves surrounded by fossils of another kind?dinosaur eggs The fossils were scattered over many acres, but in some places, the ground was so densely covered, the scientists couldn?t even walk without stepping on the fragile remains. They soon realized they were standing in the middle of what had been dinosaur nesting grounds. The scientists set up for a full investigation of the area. In addition to dinosaur eggs and embryos, the crew also discovered the fossilized bones of an adult dinosaur. With this information, and with the help of geologists who analyzed the rock layers around the site to date the findings, the scientists identified which dinosaurs laid the eggs?and which dinosaur predators lurked at the edges of the nesting site. In addition, they figured out what catastrophe not only killed the unborn dinosaurs, but also preserved the site for millions of years.