The document describes several biodiversity studies conducted by the Illinois Department of Natural Resources (IDNR) for K-12 students. The studies involve collecting data on spiders, frogs and toads, and squirrels. For each study, students learn about the species, identify local habitats to observe, collect weekly data, and submit monthly reports. Students can view data collected by other classes on interactive species maps. The goal is to involve students in authentic scientific research to help scientists study changes in local habitats and biodiversity over time.