If you want to look into the topic more here are some sites I used:

Sources: http://www.impactlab.net/2010/07/15/scientists-prove-which-came-first-the-chicken-or-the-egg/ 4/10/2010

http://www.msnbc.msn.com/id/38238685/ns/technology_and_science-science/  5/4/2010

http://lifeinthefastlane.com/2010/07/chicken-or-the-egg/  4/10/2010