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. 2020 May 26;10:8727. doi: 10.1038/s41598-020-65425-y

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© The Author(s) 2020

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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Technical drawing of the observation hive. The recorded brood area (fov = field of view) contained six glass stripes (light grey / red overlay) to mount combs (not shown), which were pressed against the glass using metal bars (not shown) across top and bottom wood blocks (deep red). The upper food super contained two MiniPlus-sized frames (yellow) and was separated from the brood area by a queen grid above the glass stripes. The food super was visible though embedded acrylic glass. The hive was fixed at the bottom using angle connectors (dark grey).