For about 6,000 years, humans and chickens have led an interconnected existence, with the latter serving the former a regular supply of nourishing meat and eggs. Evolving from an Asian species of red jungle fowl, our modern domesticated chicken is remarkably passive, can lay many eggs quickly, and has little fear of humans. But these traits were not always common in the animal, and a team of scientists has recently managed to pinpoint the time in history when chickens went through their major evolutionary shift.