1. Department of Biology, University of Miami, Coral Gables, FL 33124, USA
2. School of Biology, University of St Andrews, St Andrews, UK
3. Laboratorio de Bioacústica, Escuela de Biología, Universidad de Costa Rica, Sede Rodrigo Facio, San Pedro, San José, Costa Rica
4. Cornell Laboratory of Ornithology, Cornell University, Ithaca, NY 14850, USA