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. (Photos: Xinhua)

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.

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.

Worker process the model of Patagotitan mayorum at Field Museum in Chicago, the United States, on May 25, 2018. 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.

A worker processes the model of Patagotitan mayorum at Field Museum in Chicago, the United States, on May 25, 2018. 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.

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.