About the Authors

Brian K. Branstetter, Sam H. Ridgway
National Marine Mammal Foundation, San Diego, California, United States of America

James J. Finneran, Brian C. Weisman
U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific, San Diego, California, United States of America

Elizabeth A. Fletcher
Maritime Services Division, Science Applications International Corporation, San Diego, California, United States of America

Corresponding Author

brian.branstetter@nmmpfoundation.org

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: BKB JJF SHR. Performed the experiments: BKB EAF BCW. Analyzed the data: BKB. Contributed reagents/materials/analysis tools: BKB JJF. Wrote the paper: BKB JJF SHR. Animal training: EAF BCW. Hardware development: JJF. Software development: BKB JJF.