About the Authors

Allen Cheung

Affiliation Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia

Lex Hiby

Affiliation Conservation Research Ltd., Gt. Shelford, Cambridge, United Kingdom

Ajay Narendra

ajay.narendra@anu.edu.au

Affiliation ARC Centre of Excellence in Vision Science, Research School of Biology, The Australian National University, Canberra, Australian Capital Territory, Australia

Competing Interests

Conservation Research Ltd is a small consultancy firm in the field of survey design and automated photo-id. Lex Hiby is its director and sole employee. This does not alter in any way the authors’ adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: AC AN. Performed the experiments: AC LH AN. Analyzed the data: AC LH AN. Contributed reagents/materials/analysis tools: AC LH AN. Wrote the paper: AC AN.