Eggs already existed here

Been saying that for ages.

But then [as the op points out] the question re-arises when asking "Which came first, the chicken or the chicken egg?" The first chicken would have been in an egg... do we call that egg a chicken egg? Is the egg defined by who laid it rather than what's in it?

• If the latter [what's in it?], which forms first? The chicken, or the egg around it? The egg.
• If the former [who laid it?], the chicken came before the chicken egg, that first chicken being in an egg named after whatever non-chicken laid it.

So which is the proper definition? I'm leaning to who laid it. The first chicken came out of a non-chicken egg. The chicken came first. And then went on to lay the first chicken egg.