A group of scientists have cat-scanned all of the theropod dinosaur skulls showing skull growth and compared them with bird and crocodilian skulls. They have determined that bird skulls as we know them are modified from dinosaur skulls that stopped growing.
http://www.nytimes.com/2012/06/05/s...arts-the-changes-from-dinosaurs-to-birds.html
http://www.nytimes.com/2012/06/05/s...arts-the-changes-from-dinosaurs-to-birds.html
