Jeholornis prima
- Theropoda
- Tetanurae
- Coelurosauria
- Maniraptoriformes
- Maniraptora
- Paraves
- Avialae
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An early, avialan theropod from the Early Cretaceous of China. Jeholornis had large wings, and a tail fan (apparently just for display) at the end of a long, bony tail. The shoulder of Jeholornis allowed a larger flapping motion than in Archaeopteryx, but smaller than in modern birds. The big wings were clearly used aerodynamically, but the limited flapping power and absence of a specialized flap-recovery mechanism suggests Jeholornis was a limited flier. Some specimens of Jeholornis preserve fossilized seeds in its gut, indicating at least a partly seed-eating diet. Since Jeholornis lacked a retroverted hallux, it presumably foraged for seeds and other food on the forest floor.