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Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
Data from colour preference trials of D. iulia meeting the training criterion. (a) Naive preferences in the morning and afternoon. (b) Preferences of butterflies from (a) post-training. Grey lines connect individuals. Data are means ± 95% CI. **p < 0.01.