1. Department of Ecology and Evolutionary Biology, University of California, Santa Cruz (UCSC), 115 McAllister Way, Santa Cruz, CA 95060, USA.
2. Island Conservation, 2100 Delaware Avenue, Suite A, Santa Cruz, CA 95060, USA.
3. Institute of Marine Sciences, UCSC, Santa Cruz, CA 95060, USA.
4. BirdLife International, David Attenborough Building, Pembroke Street, Cambridge CB23QZ, UK.
5. Department of Zoology, University of Cambridge, Downing Street, Cambridge CB23EJ, UK.
6. Institute for Environmental Protection and Research, and Chair of the International Union for Conservation of Nature Species Survival Commission Invasive Species Specialist Group, Via V. Brancati 48, Rome 00144, Italy.
7. Instituto de Ecología, Universidad Nacional Autónoma de México, México D.F. 04510, México.
8. Conservation Metrics, UCSC Coastal Science Campus, 145 McAllister Way, Santa Cruz, CA 95060, USA.