The arrows in a food chain represent the flow or transfer of energy in an ecosystem. They indicate the direction of the flow of energy, always pointing from the eaten to the eater. For example, an arrow pointing from grass to a zebra means that the grass gives energy to the zebra when the zebra eats the grass. The arrows usually point to the organisms that are doing the eating. The tail of the arrow starts at the organism that is being eaten, and the head of the arrow points to the organism that is doing the eating. The arrows in a food chain show the transfer of energy from one organism to another as one organism is eaten and its energy is transferred to the organism that ate it.