What changed
A Late Jurassic fossil from Fujian has revealed what researchers describe as the earliest known flightless bird. Named Yangyuan yanzhi, the animal lived about 148–150 million years ago, weighed roughly 821 grams and was adapted for running on land.
Wang Min’s Chinese Academy of Sciences team and collaborators at the Fujian Institute of Geological Sciences placed it within a new early-bird group, Zhengheornithidae, rather than among deinonychosaurs. The study was published in Nature on October 14, 2026.
Why it matters
Yangyuan yanzhi complicates the familiar story that early birds evolved mainly by becoming better at flight. Its forelimbs were unusually short, while its foot carried a specialised second toe associated with gripping or running. Its skull, pelvis and limbs also combine dinosaur-like and bird-like features.
That mix matters because it shows that birds were experimenting with different bodies and lifestyles very early in their history. Flight was not the only obvious destination. Some early birds were already moving toward life on the ground, with anatomy suited to terrestrial hunting and running.
The classification is supported by the researchers’ evolutionary analysis, though future fossils and phylogenetic work may refine the picture. In a constrained test, placing Yangyuan yanzhi among deinonychosaurs required 14 additional evolutionary steps. Its discovery turns a thin stretch of the early bird fossil record into a more complicated scene: not a straight runway toward modern flight, but a crowded evolutionary landscape with several paths opening at once.
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