1. K. Lisa Yang Center for Conservation Bioacoustics, Cornell Lab of Ornithology, Cornell University, Ithaca, NY, USA
2. USDA Forest Service, Sierra National Forest, Prather, CA, USA
3. USDA Forest Service, Humboldt-Toiyabe National Forest, Sparks, NV, USA
4. USDA Forest Service, Stanislaus National Forest, Sonora, CA, USA