Imagine you are a Doduo. You were born with and live every day alongside your brother, the other head. You guys don't always get along but you love him and he loves you. You cannot imagine ever being apart.

Suddenly, you evolve. You look different... but so does your brother. And who the hell is this third guy?! Which one is your brother? How do you reconcile an entirely new entity invading the body that you and your brother shared for so long? Do you think the third Dodrio head is ever shunned? Do the original two heads have a crisis of conscience and develop a psychological trait unique to Dodrio that renders two of the three heads catatonic as they are unable to compartmentalize this world-rending development?