How many times have we asked ourselves the question of whether the chicken or the egg came first? There are all kinds of theories to answer it, although to date no one has been able to give a definitive answer. But this has recently changed following a scientific study published in the journal “Science”. It is an investigation carried out by experts based on objective data, so that we can take it as a reference to end the dilemma once and for all. Mary Stoddard, from Princeton University, one of the authors of the study, points out that his team began to wonder why the eggs were differently shaped. Traditional theory indicates that it depended heavily on two factors: the location of the nest and the number of young. However, the researchers revealed that it was due to their ability to fly. Once this unknown finding was discovered until now, scientists continued investigating to learn more about the different mysteries that exist around these birds, including that of if the chicken or the egg came first. Well, finally, after many years of doubts and speculation, they came up with the answer. According to Stoddard, it was the egg first. A specialized, in-shell egg evolved over time in some vertebrates as they adapted to life on land. Much later, these animals became the first vertebrates on planet Earth, including birds. Therefore, taking Darwin’s Theory of Evolution as a reference, the egg came before the chicken. The hen was formed inside an egg of another animal species, surprising as it may be. This explains how the transition and evolution of species occurred.Fun Facts About Chickens Now that we’ve unraveled the mystery, it’s time to learn about some of the most curious facts about chickens. Do you know that there are more chickens than people in the world? Yes, according to the calculations of scientists there are an estimated 25 billion chickens, so they are the most numerous species of birds. Their domestication began 8,000 million years ago, and they are the closest living descendant of the Tyrannosaurus Rex is the hen. In addition to the white and brown eggs that we all know, there are some breeds of chickens that lay eggs of other colors such as blue or green.