This article in the September 2016 issue of The American Biology Teacher describes an investigation designed to help students engage in three-dimensional learning as they explore the phenomenon of biodiversity in two natural areas of different sizes. Using arthropods as a model group of organisms, the article describes how one class observed two unmowed natural areas on school grounds over time to measure the number of species. Students formulated their own hypotheses, designed their investigations, and assessed arthropod species diversity over time. The students analyzed their results using a variety of mathematical representations described below. The author relates that food webs, energy flow through ecosystems, and biodiversity were topics covered in class throughout the investigation. Relevant materials used in this investigation included studies of food webs from the Biology Corner (http://biologycorner.com) and an online biodiversity calculator (http://www.alyoung.com/labs/biodiversity_calculator.html).