Dr. GURU speaks,

The evolution of a wild Indian or south-east Asian Red (Gallus gallus) or Grey (Gallus Sonneratii) Junglefowl to a Chicken can be traced back to a set of gene mutations which occured in the Egg of a female Junglefowl. The mutations manifest themselves to give what we would classify as a Chicken.

The Junglefowl does not turn into a Chicken half way through its life, it lays the Egg that gives birth to the Chicken.

The GURU must now sleep.