Tragedy of the Commons Lab, Colored Goldfish, AP Environmental Science

So much fun for students! This is a lab they remember all year, and you know it's a win when they put photos of your class on their snapchat story :) Simple setup, and includes detailed, step-by-step teacher instructions for directing lab during class. Materials needed: colored goldfish, straws, butcher paper, markers. This lab is readily available for free, but my version greatly simplifies it for teachers, and enhances it for students by using different colors of goldfish to represent different species and including some other surprise 'events' to introduce during the lab.