1. Washington Cooperative Fish and Wildlife Research Unit School of Aquatic and Fishery Sciences University of Washington Seattle Washington 98195 USA
2. U.S. Geological Survey Fort Collins Science Center 2150 Centre Avenue, Building C Fort Collins Colorado 80526 USA
3. School of Environmental and Forest Sciences University of Washington Seattle Washington 98195 USA
4. U.S. Department of Agriculture APHIS Wildlife Services National Wildlife Research Center 233 Pangelinan Way Barrigada 96913 Guam
5. Marine Mammal Laboratory NOAA‐NMFS Alaska Fisheries Science Center Seattle Washington 98115 USA
6. U.S. Geological Survey Washington Cooperative Fish and Wildlife Research Unit School of Environmental and Forest Sciences & School of Aquatic and Fishery Sciences University of Washington Seattle Washington 98195 USA