Hk_mp5kpdw, species designations are kind of arbitrary. You cannot make a cut-off point between the parents and children and say on one side they are ancestral species A and on the other descendant species B. Species distinguish themselves over several generations.
An analogy is that you cannot make a clean cut-off point between Vulgar Latin/Romance and Old French, Old Spanish, etc. It's another case of a slow build up of change over time.
Okay, now for my answer to the question: The chicken came at the same time as the chicken egg because the egg is a developing chicken!