Which came first, the chicken or the egg?

Eggs evolved more than a billion years ago, whereas chickens have been around for just 10,000 years. So the riddle is easily solved…or is it?

Scientists believe they have cracked evolution's biggest mystery

Curious Kids: what came first, the chicken or the egg?

So who came first, The Chicken or the Egg?

Which came First: The Chicken or the Egg?

Q: Which Came First—the Chicken or the Egg?

The Science of Which Came First, the Chicken or the Egg, Animated

Which came first, the chicken or the egg? - Quora

What Came First, The Chicken or The Egg?

Which came first, the chicken or the egg? A Model for Change