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. 2019 Feb 4;9:1366. doi: 10.1038/s41598-018-37613-4

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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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Super-enriched terrarium. Each terrarium (100 cm × 34 cm × 40.5 cm)²⁵ included wire mesh on top and on one of the short sides, a second level that could be reached via two stairs and a passable standard polycarbonate cage type III equipped with food and water. Additionally, wood shavings, two semi-transparent red plastic houses, a wooden climbing frame and pressed cotton as nesting material were provided (photo of the two black mice: Dirk-Heinz Loddenkemper).