The timing of seasonal ecological events, known as phenology, plays an important role in how ecosystems function. As a result of rapid climatic change, many ecological events associated with spring are now occurring earlier. This has prompted concern that species (such as predator-prey) interactions are becoming decoupled in time, which may have negative ecological consequences. This case study presents an overview of the importance of phenology and how phenological change might be disrupting species interactions, with a particular focus on migratory birds and their prey resources. Students complete exercises (using tools such as R or Excel) to process, analyze, and visualize data from an actual research study. They also consider how to interpret these findings in light of recent large-scale declines in the abundance of North American birds and how this information might be used to mitigate the impacts of future global change. The case is designed for upper-division undergraduate or graduate courses in ecology, environmental science, climate change, and could also be used in some organismal courses, such as botany, zoology, or ornithology.