Affiliation: | 1. Nicholas School of the Environment, Duke University Marine Laboratory, Beaufort, NC, U.S.A.;2. Pratt School of Engineering, Duke University, Durham, NC, U.S.A.;3. Cetacean Research Unit, Murdoch University, Murdoch, WA, Australia;4. Department of Biology, Hopkins Marine Station, Stanford University, Monterey, CA, U.S.A.;5. Fisheries and Wildlife, Marine Mammal Institute, Oregon State University, Newport, OR, U.S.A. |