Photo taken on May 25, 2018 shows the model of Patagotitan mayorum at Field Museum in Chicago, the United States. The model of 122-foot-long (37.2 meters) titanosaur will be on display at the Field Museum in Chicago in recent days. Known by its scientific name of Patagotitan mayorum, the plant-eater lived 100 millions years ago in Argentina represents world's biggest land animal. (Xinhua/Wang Ping)