Technical Abstract: Aeroecology is an emerging scientific discipline that integrates atmospheric science, terrestrial science, geography, ecology, computer science, computational biology, and engineering to further the understanding of ecological patterns and processes. The unifying concept underlying this new transdisciplinary field of study is a focus on the planetary boundary layer and lower free atmosphere (i.e., the aerosphere), and the diversity of airborne organisms that inhabit and depend upon this aerial environment for their existence. Here we focus on the role of radars and radar networks in aeroecological studies. Radar systems are primarily used to monitor weather conditions and track the location and movements of aircraft. However, radar echoes regularly contain signals from other sources, such as birds, bats, and insects. The potential of using radar to track and monitor volant animals became apparent to researchers soon after its initial development. Today, hundreds of radar installations are located around the world and it has become easier to access and process the vast data sets resulting from these instruments. Additionally, radar systems are becoming increasingly sophisticated with the advent of innovative signal processing and dual-polarimetric capabilities. We examine some of the many potential benefits coming from radar aeroecology for meteorological and biological research over a wide range of spatial and temporal scales as well as species. This approach is also timely given the importance of using this technology for understanding factors that affect movements of animals in the aerosphere relative to regional and global climate change.