I use this with the Great lakes food webs found from the NOAA website. Print the food webs from the NOAA link provided in the file and then distribute a food web to each student. Use the graphic organizers to find information about each lake's dynamics, then work in lake groups, and finally in a mixed 5 lake group to compare and contrast lake food webs. I've included a black and white version and two different color versions (blue-toned, water!) of this two-sided graphic organizer.