A report on concerns about possible effects of aerial drones on raptors. Arizona Game and Fish Department's continuing work on installation of wildlife crossovers and underpasses along Interstate 17. near Flagstaff. A report from Tucson Bird Alliance on the Purple Gallinule wetland bird increasingly spotted in Arizona. Bird of the episode: Bell's Vireo. Birding hotspot: Borderlands Cabeza Prieta National Wildlife Refuge. Friends of wildlife: Arizona Sonoran Desert Museum, Tucson.