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Are birds evolved from small bipedal dinosaurs?

Are birds evolved from small bipedal dinosaurs?

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Answer #1

Deinonychus was a theropod, one of a group of bipedal, carnivorous dinosaurs that also included Tyrannosaurus rex.
Dinosaurs evolved bird-like characteristics long before the appearance of Archaeopteryx.
Archaeopteryx is the Late Jurassic fossil usually thought to be the earliest bird.
The gradual evolutionary change might have started about 160 million years ago, wherein from fast-running, ground-dwelling bipedal theropods to small, winged flying birds were evolved.

During the course of this evolution, the body size of some theropod groups gradually decreased. This, together with many other changes to the skeleton, ultimately led to the appearance of birds.

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