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Supplemental Information

Table S1

Nest visits (extracted from NestWatch.org) documenting the chronology of an Eastern Bluebird nest attempt containing twin embryos.

DOI: 10.7287/peerj.preprints.186v2/supp-1

Additional Information

Competing Interests

The authors have no competing interests.

Author Contributions

Robyn L. Bailey 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.

Gerald E. Clark conceived and designed the experiments, performed the experiments, contributed reagents/materials/analysis tools, prepared figures and/or tables, reviewed drafts of the paper, collected data.

Animal Ethics

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

Research was conducted under the Cornell University Institutional Animal Care and Use Protocol # 2008-0083.

Grant Disclosures

The following grant information was disclosed by the authors:

National Science Foundation grant No. 0540185

Funding

NestWatch is supported by the Cornell Lab of Ornithology and was founded under the National Science Foundation grant No. 0540185. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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