Williams Rob, Burgess Matthew G, Ashe Erin, Gaines Steven D, Reeves Randall R
Oceans Initiative, Seattle, WA 98102, USA.
Sea Mammal Research Unit, Scottish Oceans Institute, University of St. Andrews, St. Andrews KY16 8LB, Scotland UK.
Science. 2016 Dec 16;354(6318):1372-1374. doi: 10.1126/science.aai8222.