In this activity, students look at data for two populations: cottontail rabbits and gray foxes. Using the data, students calculate the growth of the populations. They then graph the data and observe the differences between exponential and logistic growth. Analysis of the data then occurs. This fits in well with NGSS Biology LS PE 2-1 and 2-2 Population Growth and AP Environmental Science 3.4 Carrying Capacity. A key is provided.