1. Biological Sciences California Polytechnic State University San Luis Obispo CA USA
2. School for Environment and Sustainability University of Michigan Ann Arbor MI USA
3. Biological Sciences Boise State University Boise ID USA
4. Macaulay Library Cornell Lab of Ornithology Ithaca NY USA
5. Biological Sciences State University of New York Plattsburgh Plattsburgh NY USA
6. Communication and Social Behaviour Group Max Planck Institute for Ornithology Seewiesen Germany