You can download an Adobe Acrobat Reader version of the cards by clicking here . You'll need to make several copies of the phytoplankton, Copepod and Herring cards. Review the concepts of food web and energy flow with your class. Mention that some copepods and other zooplankton migrate towards the ocean's surface at night to feed on phytoplankton. Herring eat copepods where they find them.
Seals usually hunt for herring during the day.
Move your clss to a field or gymnasium, or rearrange your classroom so there is room for this activity. Two classes can be combined for this activity. Hand each copepod an empty bag. Instruct the class that you will be scattering phytoplankton around the area. Then they should turn their backs to you as you distribute the phytoplankton around the large open space.