1. Cornell University Museum of Vertebrates, Department of Ecology and Evolutionary Biology, Cornell University , Ithaca, NY , United States
2. Cornell Lab of Ornithology , Ithaca, NY , United States
3. Department of Ecology and Evolutionary Biology, Cornell University , Ithaca, NY , United States
4. Manning College of Information and Computer Sciences, University of Massachusetts–Amherst , Amherst, MA , United States