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. 2019 Jun 12;9:8558. doi: 10.1038/s41598-019-44976-9

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Number of pod reorientation events as a function of unmanned aerial vehicle (UAV) absence or presence at 10, 25, and 40 m operating altitude. Different lower-case letters indicate statistically significant differences at α = 0.05 (multiple comparison procedure using Tukey contrasts). Black filled circles indicate outliers (first quartile − 1.58 × interquartile range or third quartile + 1.58 × interquartile range). Bottlenose dolphins were photographed during UAV disturbance tests around Great Barrier Island, New Zealand (36°10′S, 175°23′E).