Alson If one needs a precise answer without foolish counter-questions then......... According to Theory of Evolution, Birds were evolved from Reptiles......and for one species to turn into another, it requires some chromosomal mutation and once the mutation occured in the fused cell, that later turned into a chicken, the chicken-egg contained the mutated zygote............ that clearly suggests....the chicken egg came before the chicken Thosse who are the believers of Theory of Spontaneous Origin, chicken came first, because god created all the organisms at one time and the chicken laid the egg later i go with the former What do u say ALSON