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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Verena Häussermann 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, literature reviews, summarizing data.

Carolina S Gutstein 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, literature review, summarizing data.

Michael Beddington conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, drift models.

David Cassis 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, literature review on red tides.

Carlos Olavarria conceived and designed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper, literature review.

Andrew C Dale conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, literature review, collection of oceanography data.

Ana M. Valenzuela-Toro conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, literature review on taphonomy.

MariaJose Perez-Alvarez conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Hector H. Sepúlveda conceived and designed the experiments, performed the experiments, analyzed the data, collection of oceanographic data.

Kaitlin M. McConnell performed the experiments, analyzed the data.

Fanny E Horwitz analyzed the data, prepared figures and/or tables.

Günter Försterra conceived and designed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper, writing of article.

Animal Ethics

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

The samples (genetics, ear bone, stomach/intestine content, mussels) were taken during the cruise of the National Fisheries Service. The report from the cruise is publicly available.

Field Study Permissions

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

Samples of marine invertebrates were collected under permit of Subsecretaría de Pesca y Acuicultura (R.EX. 1295 del 27.04.2016). Samples of cetaceans were authorized by SERNAPESCA, Region de Aysen (Acta Numbers 2016-11-10 and 12).

Data Deposition

The following information was supplied regarding data availability:

The research in this article did not generate any raw data.

Funding

The expedition during which VH discovered the initial whales was funded by Fondecyt Project 1131039, the overflight by National Geographic Society/Waitt Grants Program #W380-15 to CSG, VH and MJP and the satellite image by a Pew fellowship for marine conservation to VH. Taphonomic analysis were funded by U-REDES (Domeyko II UR-C12/1, Universidad de Chile) to A. Vargas and Consultora Paleosuchus LTDA. MJP was funded by CONICYT Postdoctoral FONDECYT Program 3140513, Projects ICM P05-002 and PFB 023. CSG was founded by Conicyt postdoctoral FONDECYT Program 3160710. 2016 expedition was funded by Blue Marine Foundation and Paulsen Editions Foundation to Keri Lee Pashuk (Saoirse) and Consejo de Monumentos Nacionales. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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