I'd say the chicken, as the egg/fetus/period thing would have slowly evolved into the hard-shelled lump we know today (this is before it is known as a "chicken" or even a bird as it would have happened while land animals were still in their earliest stages, or possibly even before land). This is where the question about when in it's evolution it was classified as a chicken because it could be halfway through the life of some other bird (the chicken came first), or the first chicken could have been born from a new egg (the egg came first, this is what Neil is saying).
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