A report on research regarding shorebird use of the Colorado River Delta by millions of shorebirds in migration. Highlights from the Northern Arizona Audubon Society August newsletter. A closeup of the Lark Bunting, elusive winter resident of the Wilcox Playa often observed with other sparrows. Bird of the episode: Barn Owl. Birding hotspot: Beaver Dam Mountains wilderness. Friend of wildlife: Arizona Natural Plant Society.