According to an ancient Greek story, the god Chaos was the first to emerge at the creation of the universe. Soon after her came Gaia (Earth), Tartaros (the Underworld) and Eros (Love). In many versions, Chaos then gave birth to the Birds. From the primordial depths of time, from Chaos herself came these winged first beings. This wild birthing created migrations and flight. In more recent times, soon after Darwin published his book, "On the Origin of the Species," scientists began a heated debate about the origin of birds. Most scientists today believe that birds are one of the few remaining...