1. Center for Neuropolicy, Emory University, Atlanta, GA 30322, USA.
2. Pinniped Cognition and Sensory Systems Laboratory, Institute of Marine Sciences, University of California–Santa Cruz, Santa Cruz, CA 95060, USA.
3. Dynamic Memory Lab, Center for Neuroscience, University of California–Davis, Davis, CA 95618, USA.
4. AnimalScan Advanced Veterinary Imaging, Redwood City, CA 94063, USA.
5. Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA.
6. The Marine Mammal Center, Sausalito, CA 94965, USA.
7. Shedd Aquarium, Chicago, IL 60605, USA.