First the egg then the chicken

A 150-million-year-old fossil of Archaeopteryx, long considered the oldest bird, may put to rest any scientific doubt that dinosaurs specifically the group of two-legged meat-eaters known as theropods gave rise to modern birds. Until recently, the crow-size specimen was housed in a private collection. It is now owned by the Wyoming Dinosaur Center in Thermopolis.Earliest Bird Had Feet Like Dinosaur, Fossil Shows