Which Came First; the Chicken or the Egg?

An ongoing debate; which came first, the chicken or the egg? not being able to have a chicken without and egg but not being able to have an egg without a chicken makes this a question that has been going on for ages (why a chicken and no other bird I'm not quite sure.)

This question is almost like a guess game, an either or/true or false one. All one has to do is pick a side and yet this riddle has scientists trying to figure it out!

http://www.msnbc.msn.com/id/38238685/ns/technology_and_science-science/t/which-came-first-chicken-or-egg/

http://en.wikipedia.org/wiki/Chicken_or_the_egg


http://articles.cnn.com/2010-07-14/world/england.chicken.egg.riddle_1_chicken-crystal-structure-human-skeleton?_s=PM:WORLD