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. 2016 Oct 21;13:48. doi: 10.1186/s12983-016-0180-y

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Bird’s-eye view of the aviary and observation room set-up (C: video cameras, G: background area, O: observers, W: dish containing water for sparrows, which also indicates the direction of west, : the parterres, : the potted plants, : small potted plants, of which two or all, depending on the experimental design, sat beside food patches covered by sand)

Inline graphic — Bird’s-eye view of the aviary and observation room set-up (C: video cameras, G: background area, O: observers, W: dish containing water for sparrows, which also indicates the direction of west, : the parterres, : the potted plants, : small potted plants, of which two or all, depending on the experimental design, sat beside food patches covered by sand)