Chicken or the Egg finally proved

Truth is, I created this theory to throw you all off. Here is the true story.

 Spoiler

Chickens came from the Planet Thorax 3000 years ago. Thorax was controlled by a group of aliens called the Thraxies. At first, they did not called chickens chicken but rather "Niffies". They looked nothing like the chickens of today. Planet Thorax was in danger of being consumed by their sun so the Thraxies did what they could to save their species and organisms. They built a space ship, loaded it up, and drifted away into space while Planet Throax disappeared. The Thraxies kept drifting and drifting away, hoping to find a new planet but never did. They all died on their space ship. 1000 Years after their space ship began drifting through space, it crashed landed on a new planet- Earth. Every Thorax organisim was dead by then; except for the Niffies. The Niffies evolved slowly and because of natural selection, mastered the art of conceiving in an egg before becoming what they are now- Chickens.