In this article, the authors present a classic playground game called "Sharks and Fishes" to introduce second- to fourth-grade students to the concept of "predation," or the relationships between a predator and its prey. By incorporating the game in a learning cycle on predation, students not only learn about predation in a memorable way, but they also have a "teacher-sanctioned" opportunity to move around during class while collecting data. The authors discuss how the game can be played, explain the concept of predation, and describe other engaging activities that explore predator-prey relationships. (Contains 3 resources.)