Which fossilized organism provides support that birds evolved from a reptilian ancestor that possessed feathers?

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Microraptor gui is a fossilized organism that provides evidence for the evolution of birds from a reptilian ancestor that possessed feathers. Microraptor gui was a small, feathered theropod dinosaur that lived in the Early Cretaceous period in China. Its feathered wings suggest that it was capable of powered flight, and its skeletal features show similarities to both birds and non-avian dinosaurs, indicating that it was an important transitional fossil in the evolution of birds from their reptilian ancestors.

Which Fossilized Organism Provides Support That Birds Evolved from a Reptilian