About the Authors

Graeme M. Buchanan
The Royal Society for the Protection of Birds, Edinburgh, United Kingdom

Paul F. Donald
The Royal Society for the Protection of Birds, Sandy, Bedfordshire, United Kingdom

Stuart H. M. Butchart
BirdLife International, Cambridge, United Kingdom

Corresponding Author

graeme.buchanan@rspb.org.uk

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: GMB PFD SHMB. Analyzed the data: GMB PFD. Contributed reagents/materials/analysis tools: GMB SHMB. Wrote the paper: GMB PFD SHMB.