POST: Food Web. Seeing live organisms can be a highlight of students’ outdoor science experience. This activity gives students a chance to reflect on the organisms they saw during an outdoor science experience, and the connection between those organisms. Students’ excitement about organisms they saw and landscapes they observed is channeled into constructing understanding of the interconnectedness of ecosystems. In Session 1, Building a Food Web, students think back on a specific ecosystem they explored, and build a food web using firsthand observations, reasoning, and secondhand sources, like field guides. Then, as a class, students use their food webs to make predictions and answer questions about the ecosystem. In Session 2, Adding a Predator, they read a case study about the reintroduction of wolves in Yellowstone National Park to deepen their understanding of ecosystem interactions, and discuss the possible consequences of reintroducing or introducing a predator to the ecosystem they have studied. Then they reflect on the usefulness and limitations of food webs for ecosystem management.