From Chicken and Egg Problem Solved:
Java Pimp writes “It seems scientists and philosophers now agree which came first. The Egg. From the CNN article: ‘Put simply, the reason is down to the fact that genetic material does not change during an animal’s life. Therefore the first bird that evolved into what we would call a chicken, probably in prehistoric times, must have first existed as an embryo inside an egg. Professor John Brookfield, a specialist in evolutionary genetics at the University of Nottingham, told the UK Press Association the pecking order was clear.’ So, does this mean we can now show P=NP?”
I always argued that the egg came first because reptiles came before birds. But I’m no fancy-shmancy scientist.
Full CNN Article: Chicken and egg debate unscrambled