Plankton isn't just a tiny cartoon character, it's also a very important food source for animals around the world. Budding scientists discuss the types and functions of plankton, including where they are found, how they are caught, and why they are important to study. Then, kids walk to the park with mini nets in hand and attempt to catch plankton for classroom observation. The instructional activity concludes as they write a friendly letter to a friend describing their scientific methods and discoveries.