The ability to fly has been mankind’s dream for thousands of years, a goal toward which thousands of scientists and researchers have expended labor, time and money. Apart from a few very primitive experiments, it became possible to make self-propelled flying vehicles only in the 20th century. This feat, which mankind managed to achieve with the accumulated technology of centuries, is something that birds—known to have existed on Earth for the last 150 million years—have always performed to perfection. Even a new-born chick will soon acquire this special ability in a matter of weeks, which humans can manage only through advanced technology. How, then, did these astonishing creatures come into being?
