Nagatitan chaiyaphumensis: a giant 27-meter-long sauropod from Thailand

In the parched hills of Chaiyaphum province, locals have discovered bones that have upended our understanding of prehistoric life in Southeast Asia. This giant, named Nagatitan chaiyaphumensis, was nearly 27 feet long and weighed about 30 tons—more than three full-grown tyrannosaurs combined.

A discovery that took years

The skeletal fragments began to be collected in 2016, when a farmer from a village near Chaiyaphum accidentally discovered a large bone protruding from the sandstone. The excavation continued until 2019, after which they were suspended due to lack of funds. It was not until 2023, when new financial support from Thai science foundations became available, that the team was able to return to the site. In 2024, scientists published additional results from a CT scan of the bones, which confirmed that the animal died in adulthood and had a well-developed air sac system - a typical feature of large sauropods.

Impressive dimensions

The humerus alone was 1,8 meters long. Paleontologists estimate the animal was 26 to 28 meters long. It weighed about 27 to 32 tons. For comparison: an adult African elephant weighs about 6 tons, so Nagatitan was heavier than four such elephants. These figures place it in the “upper middle” category of all known sauropods. Later Cretaceous giants could weigh up to 70 tons, but it was in the Early Cretaceous, 100 to 120 million years ago, that the rapid increase in size began.

A name that combines myth and science

The word "Naga" comes from a mythical serpent revered in many Southeast Asian cultures. "Titan" refers to its gigantic size. The specific name chaiyaphumensis refers to the province where the remains were found. Thus, the name not only describes the animal, but also honors the local heritage.

How did these giants live?

Rapid growth after hatching was essential. Young individuals became large in a matter of years, which protected them from predators. Nagatitan's bones show clear growth lines, which indicate an accelerated metabolism. The plant food it consumed grew in the floodplain forests of contemporary Thailand. Analysis of pollen and leaves found in the same deposits allows us to imagine the landscape: a warm and humid climate, dense thickets of ferns and conifers.

Significance for Southeast Asian science

Before this discovery, only smaller sauropods were known from the region. Nagatitan is the 14th dinosaur species to be named from Thailand and the first to be comparable in size to African or South American giants. In 2024, an international team published new data on the microstructure of the bones, which confirm that the animal lived in conditions of seasonal rainfall. This helps to understand how sauropods adapted to different climates.

The future of excavations in Thailand

Geologists believe that the formation where Nagatitan was found is the last in the country capable of preserving large bones. Further searches will likely yield only smaller remains. At the same time, local communities are increasingly involved in protecting the sites. In 2023, a small open-air museum opened in Chaiyaphum, where schoolchildren can see replicas of the bones and learn about the work of paleontologists.

Why is this important today?

Each new discovery fills in the blanks on the map of dinosaur evolution. Nagatitan shows that even in regions considered "poor" in large fossils, giants can hide. It inspires young scientists from Asia to choose paleontology and reminds us that the history of the Earth is far from being completely revealed.