The keel is made of bones in the chest that arch together. Its shoulder bones, called a girdle , also look like those of the modern bird. This creature also had hands that had adapted to look something like wings. It was covered with feathers, not scales. The tail was long compared to the body.
Scientists think the long tail helped it to fly.
The bones were also hollow like those of modern birds today. This fossil was found in the Liaoning province of China.