Collection of four raw grains (broomcorn millet, wheat, rye, and sunflower seeds), Shutterstock; Gray dove on a white background, Shutterstock; Ping pong; Shutterstock; Greek salad, Shutterstock; Boy with salad; Thinkstock; Two pigeons play a version of ping pong, Yale Joel/Time & Life Pictures/Getty Images; Pigeons © Zoonar GmbH/Alamy.