About the Authors

Becki Lawson

becki.lawson@ioz.ac.uk

Affiliation Institute of Zoology, Zoological Society of London, Regents Park, London, United Kingdom

Shelly Lachish

Affiliation Edward Grey Institute, Department of Zoology, University of Oxford, South Parks Road, Oxford, United Kingdom

Katie M. Colvile

Affiliation Institute of Zoology, Zoological Society of London, Regents Park, London, United Kingdom

Chris Durrant

Affiliation Institute of Zoology, Zoological Society of London, Regents Park, London, United Kingdom

Kirsi M. Peck

Affiliation British Trust for Ornithology, The Nunnery, Thetford, Norfolk, United Kingdom

Mike P. Toms

Affiliation Royal Society for the Protection of Birds, The Lodge, Sandy, Bedfordshire, United Kingdom

Ben C. Sheldon

Affiliation Edward Grey Institute, Department of Zoology, University of Oxford, South Parks Road, Oxford, United Kingdom

Andrew A. Cunningham

Affiliation Institute of Zoology, Zoological Society of London, Regents Park, London, United Kingdom

Competing Interests

The authors received some funding support from commercial sources including CJ Wildbird Foods Ltd, Cranswick Pet Products and Gardman Ltd. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: BL BCS KMP MPT AAC. Performed the experiments: BL SL KMC CD KMP MPT. Analyzed the data: BL SL CD. Contributed reagents/materials/analysis tools: BL BCS SL KMP MPT AAC. Wrote the paper: BL SL BCS AAC.