links Cassin's Sparrow Nature Notes broadcast from Marfa Public Radio. Cassin's Sparrow BirdNote broadcast from Public Radio International's Living on Earth Environmental News Magazine. Cassin's Sparrow blog at CassinsSparrow.org – Long-running science blog that explores the history of Cassin's Sparrow's discovery, what we've learned about the species since, and why it matters. Cassin's sparrow Native birds of the Plains-Midwest (United States) Fauna of the Chihuahuan Desert Birds of the Rio Grande valleys Cassin's sparrow Cassin's sparrow