This class was designed for an introductory ecology course. Students are introduced to Microsoft Excel PivotTables by amending an existing PivotTable, then create their own PivotTables to explore the main data sets. These data sets provide information on the breeding success of carrion crows parasitized by great spotted cuckoos in Spain. Students summarise the large data sets, produce bar charts, calculate standard errors and add error bars to their plots. As they work through the exercises, students are asked to summarise the results they have obtained and to think about what this means ecologically. Finally, they use the whole set of results to understand the nature of the interaction between cuckoos and crows in this area.