JIAN

Jian changmaensis is a microraptorine from the Early Cretaceous Xiagou Formation of the Changma Basin in Gansu, northwestern China—known from a beautifully preserved shoulder and forelimb. Even this limited material reveals a surprisingly large glider, its long upper arm indicating a wingspan on the order of a modern barn owl. The fused shoulder girdle confirms it was an adult, and its limb proportions match those of dromaeosaurines adapted for controlled gliding rather than sustained flapping, moving through the canopy with the drifting agility of a flying squirrel.

Jian is the first non-avian dinosaur ever identified from a fossil bed otherwise overflowing with more than a hundred exquisitely preserved Early Cretaceous birds. The slab containing its bones was strewn with broken, pellet-like clusters of bird remains, the compacted fragments typical of a predator's regurgitated pellets. In a site dominated by birds but nearly devoid of predators, this lone microraptorine becomes the prime suspect—a small, agile hunter whose gliding ambushes may have shaped the very avifauna preserved around it.