Science records the development of agriculture back more than 10,000 years with Neolithic evidence of crops of wheat, barley, peas, lentils, chick peas, flax, and rice. Following the sowing and harvesting of grains and legumes, early Old World farmers domesticated pigs, then sheep, and then cattle. New World farmers focused on sorghum and potatoes, followed by coca, llamas, alpacas, and guinea pigs. Maize and cotton were latecomers to the agricultural repertoire.