Over 900 species of scarab beetles are found in North America alone. There are two major groups of scarabs, the dung beetles and the chafer beetles. Dung beetles live on decaying plant material, while chafer beetles eat only the tender shoots of young plants. Dung beetles get their name from the fact that they deposit their eggs in small balls of dung. After the eggs hatch, the larvae feed on the dung until they metamorphose into adults.