On a 2009 hike in the Huachuca Mountains of southeastern Arizona, a group of birders heard an otherworldly, ethereal bird song floating, flute-like, through the canyon. The hikers identified the singer as a brown-backed solitaire, recognizing immediately that the bird was very far from home. The brown-backed solitaire spends its life in the mountain forests of Mexico and Central America—what was it doing in Arizona?