About the Authors

T. Gridley

Roles Conceptualization, Data curation, Writing – original draft, Writing – review & editing

tessgridley@yahoo.co.uk

Affiliation Centre for Statistics in Ecology, Environment and Conservation, Department of Statistical Sciences, University of Cape Town, C/o Sea Search Research and Conservation NPC, Muizenberg Cape Town, South Africa

S. H. Elwen

Roles Conceptualization, Funding acquisition, Writing – review & editing

Affiliation Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, C/o Sea Search Research and Conservation NPC, Muizenberg Cape Town, South Africa

G. Harris

Roles Data curation, Project administration, Validation, Writing – review & editing

Affiliation The South African Association for Marine Biological Research, uShaka Sea World, Point, Durban, South Africa

D. M. Moore

Roles Formal analysis, Writing – review & editing

Affiliation Department of Biosciences, Durham University, Durham, United Kingdom

A. R. Hoelzel

Roles Formal analysis, Methodology, Writing – original draft, Writing – review & editing

Affiliation Department of Biosciences, Durham University, Durham, United Kingdom

F. Lampen

Roles Data curation, Project administration, Validation, Writing – review & editing

Affiliation The South African Association for Marine Biological Research, uShaka Sea World, Point, Durban, South Africa

Competing Interests

GH and FL are employees of uShaka Sea World. The authors TG and SE have declared that no competing interests exist. This does not alter our adherence to PLOS ONE policies on sharing data and materials.