About the Authors

Charlotte Curé

cc201@st-andrews.ac.uk

Affiliation Sea Mammal Research Unit, School of Biology, University of St. Andrews, Fife, St. Andrews, United Kingdom

Ricardo Antunes

Affiliation Sea Mammal Research Unit, School of Biology, University of St. Andrews, Fife, St. Andrews, United Kingdom

Filipa Samarra

Affiliation Sea Mammal Research Unit, School of Biology, University of St. Andrews, Fife, St. Andrews, United Kingdom

Ana Catarina Alves

Affiliation Sea Mammal Research Unit, School of Biology, University of St. Andrews, Fife, St. Andrews, United Kingdom

Fleur Visser

Affiliations Netherlands Organization for Applied Scientific Research (TNO), The Hague, The Netherlands, Kelp Marine Research, Hoorn, The Netherlands

Petter H. Kvadsheim

Affiliation Norwegian Defense Research Establishment (FFI), Horten, Norway

Patrick J. O. Miller

Affiliation Sea Mammal Research Unit, School of Biology, University of St. Andrews, Fife, St. Andrews, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CC PHK PJOM. Performed the experiments: CC RA FV ACA FS PHK PJOM. Analyzed the data: CC. Contributed reagents/materials/analysis tools: RA FV FS. Wrote the paper: CC. Scientific project leaders: PHK PJOM. Elaborated the methodology for data collection on group size: FV.