The Neolithic or new Stone Age saw the beginnings of agriculture. Animals such as the cow and sheep were domesticated and provided a ready supply of meat, milk, wool, leather and bone. Grain was the first food that could be stored for long periods of time. Grain needed to be processed so stones were used for scything (cutting grass crops) and grinding. The need to harvest and store grain meant that it became necessary to stay in one place and settlements could develop. Large scale construction could take place, trade developed and people began to have different roles such as leader, priest, fighter, farmer, hunter or slave.