Jian Fossils Show 120-Million-Year-Old Raptor Hunted Birds in China

Q: A dinosaur that hunted like an owl? What fossil clue cracked this 120-million-year-old mystery?

The key clue was a set of crushed bird-bone clusters that looked like fossilized owl pellets, later linked to the newly discovered dinosaur *Jian changmaensis*. For years, paleontologists working in the Changma Basin in northwestern China found strange masses of broken bird bones at a site rich in early bird fossils. The bone clusters closely resembled the regurgitated pellets produced by modern owls after eating prey, suggesting a predator was swallowing birds and coughing up the indigestible remains. The mystery was cracked when scientists identified *Jian changmaensis*, a small feathered dromaeosaur closely related to *Velociraptor* and *Microraptor*. Its fossil is incomplete—five well-preserved shoulder and arm bones—but it was the only known non-avian carnivore from that bird-dominated locality. That made it the strongest candidate for the “pellet maker.” Researchers say *Jian* was about the size of a barn owl and likely had long feathers on both its forelimbs and hindlimbs, giving it a four-winged, gliding body plan. That anatomy suggests it could have launched ambush attacks in a lakeside ecosystem crowded with birds such as *Gansus*. In effect, the fossilized pellets, combined with the discovery of *Jian* itself, revealed a 120-million-year-old predator that may have hunted birds in a way broadly similar to a modern owl.

Q: This four-winged gliding raptor was built from just five bones. How much of it is speculation?

A substantial part of the “four-winged gliding” description is inference, not direct observation. What is solid is the fossil itself and its identity. *Jian changmaensis* is based on an articulated partial left shoulder and arm: scapulocoracoid, humerus, radius and ulna — five bones. Those bones were well preserved in 3D and contain features that place the animal within Microraptorinae, a subgroup of small feathered dromaeosaurs closely related to *Microraptor* and *Velociraptor*. Calling it a small “raptor” is therefore well supported. The “four-winged” part is a strong but indirect reconstruction. *Jian*’s fossil does not preserve hind limbs or feathers, so scientists did not actually find the second pair of wing-like feather surfaces on this specimen. They infer that from its close relationship to *Microraptor* and other microraptorines, which are known from much more complete fossils with long feathers on both arms and legs. The “gliding” claim is more tentative still. The preserved shoulder and forelimb anatomy suggests aerial ability may have been possible, and the researchers describe it as possibly volant. But with no preserved feathers, tail, hands, or hind limbs, they cannot directly test how it moved through the air or whether it glided, flapped, or mainly hunted on the ground. Its proposed role as the maker of bird-bone “pellets” is also a hypothesis based on context, not direct proof. It is the best current explanation, but still circumstantial.

Q: This raptor expands its family's known range by hundreds of miles. What does this reveal about dinosaur geography?

It shows that this group of feathered raptors was far more widespread across ancient Asia than scientists had confirmed before. Until *Jian changmaensis*, microraptorines were mainly known from northeastern China’s Jehol Group. Finding a close relative in Gansu Province, hundreds of miles to the northwest, extends the family’s confirmed range into a separate Early Cretaceous basin. That means their distribution was not narrowly local, but spread across a broader swath of the continent. The discovery also suggests that distant regions of China may have shared similar habitats and connected ecosystems about 120 million years ago. Researchers say the Changma Basin and the Jehol region may have had comparable paleoenvironmental settings, which would help explain why related small predators could live in both places. More broadly, the find is a reminder that dinosaur geography is still shaped by an incomplete fossil record. A family can appear restricted simply because fossils have only been found in one area. New discoveries like *Jian* often reveal that ancient animals occupied larger ranges and moved across wider land corridors than previously documented. In practical terms, *Jian* strengthens the picture of Early Cretaceous Asia as a connected landscape supporting shared dinosaur faunas, rather than isolated pockets of evolution.

3 articles · Updated · Reuters · Jun 9

Five shoulder and arm bones from Gansu Province identify Jian changmaensis, a barn-owl-sized dromaeosaur that lived about 120 million years ago in a bird-rich lakeside ecosystem.
Pellet-like clusters of crushed bird bones at the site suggest Jian preyed on birds and regurgitated remains much like modern owls, making it the likely "pellet maker," researchers said.
About 1 meter long including its tail, Jian was closely related to Velociraptor and Microraptor and probably carried long feathers on both arms and legs.
That anatomy suggests a ground-and-tree ambush predator that may have glided like a flying squirrel, underscoring how closely some small feathered raptors approached early birds without being birds.