Scientists discovered a 125-million-year-old dinosaur in China with skin cells still intact and hollow spikes no dinosaur has ever had

The word “fossil” usually makes you think of bones, sometimes a footprint, but rarely skin and skin cells. But a juvenile dinosaur from north-east China described in a 2026 study in the journal Nature Ecology & Evolution is so well preserved that its skin remains down to the cellular level, nuclei included, as described by paleontologist Jiandong Huang and an international team. The dinosaur has been named Haolong dongi and is reshaping what scientists thought they knew about how dinosaurs looked and felt, according to the CNRS press release, whose scientists co-led the research.

This one is for you if you loved Jurassic Park as a kid but kind of knew the science was fudged in the movies. This is a real fossil, not a movie prop: a real animal, 125 million years old, and it still preserves remarkable detail.

Meet Haolong dongi, the "spiny dragon"
Haolong dongi was an iguanodontian, a group of herbivorous dinosaurs with beaks and powerful hind legs. The fossil was discovered in the Yixian Formation in Liaoning Province, China, and is from the Early Cretaceous, around 125 million years ago. The specimen is a nearly complete, articulated juvenile skeleton about 2.4 meters or some 8 feet long. Its genus name "Haolong" means "spiny dragon" and the species name "dongi" is in honor of Dong Zhiming, a pioneer of Chinese paleontology.

The plot twist: hollow spikes nobody had ever seen before
The dinosaur had skin covered in spikes that had not been previously found on a dinosaur, with large overlapping scales on the tail and smaller bump-like scales on the neck and chest. These spikes, the Nature Ecology & Evolution paper states, were neither modified bone, like the plates of a Stegosaurus, nor feathers. They were "cutaneous," growing straight from the skin, and were hollow, cylindrical things with a hardened outer layer, a layer of living cells beneath that, and a porous core in the center.

Using X-ray scanning and high-resolution histology, or microscopic examination of ultra-thin slices of tissue, the scientists were able to study the fossil at a level of detail that most dinosaur specimens will never allow, the CNRS said in a statement. That's how they found the spikes were hollow, and that skin cells had been preserved after 125 million years. That is something that you almost never see in the fossil record for that long.

Why would a dinosaur need porcupine-style spikes anyway
Haolong dongi was a herbivore living at the same time as small carnivorous dinosaurs. The Sci. News report explains the spikes probably had a defensive function, like the quills of a porcupine, turning the animal into a really nasty prospect for any predator. But researchers haven't settled on one explanation. The spikes may also have helped regulate body temperature by increasing surface area, or played a sensory role, the study said, helping the animal detect movement or changes in its environment.

One important caveat: this specimen was a juvenile, so scientists don't really know yet whether adult Haolong dongi kept these same spikes as they grew up, or whether the structures changed with age, according to the CNRS release. That’s a question for future fossil finds to answer.

Why this matters beyond the "cool dinosaur" factor
It may be tempting to file this under a neat science fact, but the discovery adds important detail to dinosaur biology. Paleontologists have been studying iguanodontians for more than two centuries, and according to the Nature Ecology & Evolution paper, it is the first confirmed finding of hollow, skin-based spikes anywhere in the dinosaur record. Our knowledge of dinosaur skin has been based mostly on fragments, a scale impression here, a feather impression there, for two centuries. A find like this shows that dinosaur skin coverings were much more varied and inventive than the textbooks have suggested, and that soft tissue can, in extraordinarily rare circumstances, survive essentially intact for well over a hundred million years.

If you’ve ever spent hours of your life doomscrolling dinosaur content since you were a kid, or you just saw a new dinosaur movie trailer and wondered how much of it is real, this is a solid reminder that the actual science keeps getting weirder and more specific than the movies ever did.