Confuciusornis

Confuciusornis is an extinct genus of early birds from the Early Cretaceous of China, distinguished by a toothless beak and, in some specimens, long paired tail feathers.

Avialae: Avialae is the group of dinosaurs that includes modern birds and their closest extinct relatives. Confuciusornis belongs to this broader lineage of bird-like dinosaurs.
Avian flight: Avian flight is powered aerial locomotion produced by birds using their wings and associated anatomy. Confuciusornis's wing bones and feathers inform hypotheses about early flight.
Jehol Biota: The Jehol Biota is an Early Cretaceous fossil ecosystem preserved mainly in northeastern China. Many Confuciusornis fossils come from rocks preserving this unusually rich ecosystem.
Fossil: A fossil is preserved evidence of past life, including body remains, traces, or chemical signatures. Confuciusornis is known from fossils that preserve unusually detailed skeletal and feather evidence.
Beak: A beak is a keratin-covered jaw structure found in birds and some other animals. Its toothless beak is one of the genus's defining anatomical features.
Flight feather: A flight feather is a stiff, asymmetrical feather that helps generate lift or control during flight. The wing feathers preserved in fossils bear on its capacity for powered flight.
Yixian Formation: The Yixian Formation is an Early Cretaceous geological unit in northeastern China famous for exceptionally preserved fossils. Its deposits have yielded important Confuciusornis specimens.
Confuciusornis sanctus: Confuciusornis sanctus is a species of Confuciusornis named from Early Cretaceous fossils in China. It is the best-known named species in the genus.
Feather: A feather is a keratinous integumentary structure characteristic of birds and some extinct dinosaurs. Feather anatomy helps place its tail plumes within the evolution of bird plumage.
Sexual dimorphism: Sexual dimorphism is a consistent difference in appearance or anatomy between males and females of a species. The long paired tail feathers may have differed by sex, though their function remains debated.

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