An overview of numerous studies on the impact of tracking technology including the installation of physical tracking devices on migrating birds. These include acoustic (audio) tracking, leg bands, collars, wing tags and full-body harnesses.  Bird-of-the-week: Cordilleran Flycatcher. Birding hotspot: Confluence of the Little Colorado River and Silver Creek in northeast Arizona. Friend of Wildlife: Black Canyon Heritage Park. Calendar of bird-friendly events coming up in Arizona.