The egg came first.  This is because animals don't just morph from a raven to a dove, or a monkey to a human while in their animal form, it takes time.  Evolution, hello!!.  This is why when two species of birds, let's call them bird X and bird Y, had a baby, it was the first chicken egg.  Bird X's genes and bird Y's genes combined to form an egg.  A XY egg, or a chicken egg.  From the egg hatched a chick, then a chicken, but the egg came first.  From that first chicken, came many more chickens because that first chicken must've had a dominant gene that allowed it to make many more chickens, but the thing that came first was the egg.

<-Back to My (Stupid) Theories