How did birds evolve from reptiles?

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It all started 200 millions years ago, when some smaller dinosaurs made their homes among rocks on high cliff-sides. By doing this, they were protecting themselves from larger meat-eating dinosaurs that were too big and heavy to climb over those rocks. It was here that the pterodactyls (meaning 'wings finger') were found. They were flying reptiles, and their ability to fly helped them to escape from the clutches of an enemy, and to swoop down to grab food.

During this period, many small reptiles were evolving characteristics which separated them from the reptile group- their feathers. The Archaeopteryx was the most familiar of these early reptilian avian. Other kinds, such as lchthyornis, had even more birdlike characteristics, and were about the size of present day gulls.