The crosstown walk is a course module that can be used in undergraduate and graduate courses in ecology, design, planning, and social sciences for students to collect ecological and social data to understand the socio-ecological drivers of environmental change in cities. The crosstown walk is particularly useful as a tool that illustrates key concepts about urban ecology and environmental justice. On this field trip, we will introduce the course module and describe how it is used in different types of course. We will introduce the Urban Biodiversity Research Coordination Network (UrBioNet) and discuss how the module can be used to introduce students to the socioeconomic and demographic drivers of biodiversity in cities, and how the module can be used in a collaborative study of biodiversity in the world's cities. Our three mile walk will be along North 7th Street in Ft. Lauderdale, a starting and ending in the predominately white and upper income Flagler Village neighborhood and going through a black working class neighborhood. We will collect data on birds, insects, and vegetation during the walk. At the conclusion of the walk we will review our findings from the walk and discuss how the module can be used in different courses and settings.