According to the text, what is the basis for dinosaurs to become birds?

Scientists found that dinosaurs had feathers, which was the basis for dinosaurs to become birds.

In the article "Dinosaurs Flying to the Blue Sky", it is clearly pointed out that at the end of the 20th century, China scientists first discovered feathered dinosaur fossils in western Liaoning, which immediately made researchers all over the world ecstatic. The discovery in western Liaoning showed the world the evidence that dinosaurs had feathers, which made the finishing touch for this picture drawn by paleontologists.

Hundreds of millions of years ago, a feathered dinosaur broke away from its own kind, flew into the blue sky and evolved into today's big bird family.