经过一路的颠簸，几位科学家终于踏上了美国的土地，他们重点考察了堪萨斯等地。在西堪萨斯，严冬成了最大障碍，而印第安人的敌视也时刻威胁着他们的安全。可他们仍然顽强地进行着发掘工作。精诚所至，金石为开。第一件鸟类化石——黄昏鸟的一段胫骨，就是在这种情况下找到的。后来，探险队还在内布拉斯加的地层中发现了大量古鸟化石。他们的心血没有白费。(After a bumpy ride, several scientists finally landed on the land of the United States, and they focused on investigating Kansas and other places. In West Kansas, the severe winter became the biggest obstacle, and the Indians’ hostility also threatened their safety. But they were still working hard on the excavation. Faith moves mountains. The first bird fossil—a section of the tibia of hesperornis, was found in this case. Later, the expedition found a large number of bird fossils in the strata of Nebraska. Their efforts were not in vain.)