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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Sievert Rohwer conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, led recent expeditions to NW Mexico.

Emily W. Grason performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, preformed the GIS Analyses.

Adolfo G Navarro-Sigüenza contributed reagents/materials/analysis tools, reviewed drafts of the paper, developed the Mexican Bird Atlas.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

UW Institutional Animal Care and Use Committee (protocol 4309-01).

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

This project was conducted under scientific collection permits provided by the Secretaría de Medio Ambiente y Recursos Naturales (SEMARNAT) to the Facultad de Ciencias (B. Hernández-Baños FAUT 0169) of UNAM.

Funding

Support for fieldwork in northwestern Mexico was provided by the Burke Museum Endowment for Ornithology, and grants from Hugh S. Ferguson, Nuttall Ornithological Club, and region 6 of the USFWS. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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