Tsintaosaurus

Tsintaosaurus spinorhinus was a large hadrosaurid (duck-billed dinosaur) that roamed what is now eastern China during the Late Cretaceous period, approximately 70 million years ago. Like its relatives, this herbivore possessed the characteristic broad, flattened snout ideal for cropping vegetation, backed by hundreds of tightly packed teeth that continuously replaced themselves — a sophisticated dental battery for grinding tough plant material.

What made Tsintaosaurus famous was its peculiar cranial crest. For decades after its 1958 description, it was depicted with a strange, forward-pointing spike jutting from its forehead — earning it the nickname 'unicorn dinosaur.' This bizarre interpretation was based on a damaged skull, and many scientists were skeptical. Recent reanalysis of the original material and new specimens has revealed the crest was actually a more typical hollow, tubular structure similar to those seen in lambeosaurine hadrosaurs, though still distinctively shaped.

The type specimen was discovered in Shandong Province, China, near the city of Qingdao (formerly romanized as Tsintao, giving the dinosaur its name). Chinese paleontologist Yang Zhongjian (C. C. Young), often called the father of Chinese vertebrate paleontology, described the species in 1958. The species name 'spinorhinus' means 'spine nose,' referencing the original interpretation of its unusual headgear.

As a facultative biped, Tsintaosaurus likely spent most of its time walking on all fours while foraging but could rear up on powerful hind legs to reach higher vegetation or scan for predators like tyrannosaurs. Its hollow crest probably functioned in vocalization, allowing it to produce resonant calls to communicate with herd members across the ancient floodplains of Cretaceous China.