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. 2021 Jan 28;11:2578. doi: 10.1038/s41598-021-82116-4

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Results from eight planned contrasts assessing latency to look and duration of looking in response to feather and snake stimuli. Center dots represent the average marginal contrast. For latency to look, a center dot to the right of the 1:1 line indicates that the hazard for the first stimulus in the comparison is greater, and therefore that the latency to look is shorter. For duration of looking, a center dot to the right of the 1:1 line indicates that duration for the first stimulus in the comparison is greater. The error bars represent ± 2.73 SE of the marginal contrast, as appropriate for eight planned comparisons. The horizontal axes reflect ratio comparisons of the paired stimuli––hazard ratio for latency to look and ratio of durations for duration of looking. For example, the hazard for the entire feather was more than three times the hazard for the 2.5 cm feather, on average.