Omg I was just talking about this with my cousine and we got to the conclusion that it was the chicken and I'm gonna tell you why. Chickens are actually an evolution of dinos so they weren't just born a chicken from one egg one day they undertook several evolutions to get to the point where they are now. So technechly the chicken came first as dino...... 2 reply
I found this on google:
"At some point in evolutionary history when there were no chickens, two birds that were almost-but-not-quite chickens mated and laid an egg that hatched into the first chicken. If you are prepared to call that egg a chicken's egg, then the egg came first." reply