Egg Cetera #2: The answer to the riddle of which came first

In the second report of our Egg Cetera series on egg-related research, let's begin with the age-old question: which came first, the chicken or the egg? Armed with knowledge of evolution, the answer is straightforward. Eggs came first. Next time you crack open an egg, think of its many unusual features, and the hundreds of millions of years of evolution that preceded its appearance." - Dinosaurs, the animal group that includes birds and their ancestors, laid eggs. This means that the ancestors of birds laid eggs long before chickens came about. Because we know so much about the evolution of life on Earth, this answer now seems obvious. But without fossils, and without understanding how evolution works, we could have got it wrong. My research focuses on the evolution of dinosaurs, and what that tells us about the evolution of the many distinctive features of birds, such as hollow air-filled bones, warm-bloodedness, feathers and flight.