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. 2018 May 4;8:7049. doi: 10.1038/s41598-018-25291-1

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© The Author(s) 2018

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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Brownian bridge movement model during the spring migration of whooper swans wintering at Sanmenxia Reservoir. H5N1 events: 1. Sanmenxia Reservoir area. 2. Hekou Reservoir. 3. Tsagaan Nur of Ordos. 4. Wuliangsu Lake. 5 Doitiin Tsagaan Lake. 6. Khunt Lake. 7. Doroo Nuur. 8. Erhel Lake. Different color boxes show the different months of whooper swan migration. Months have some overlap owing to individual differences in whooper swans migration. Dark blue boxes, dark green boxes and red boxes represent January to February, February to May and May to September, respectively.