What came first, the chicken or the egg?

Obviously, it's the chicken because the first appearance of the word 'chicken' in a Perplexus problem is in:
Old man - older problem (Posted on 2002-06-28)  pid=134

The first mention of 'egg' is in:
Eggalicious (Posted on 2002-07-05)  pid=147

Although I suspect the author's intended answer is the one given by elementofsurprize

Posted by Larry on 2006-11-21 21:02:26