Retraction: Stuckert, A. M. M., Chouteau, M., McClure, M., LaPolice, T. M., Linderoth, T., Nielsen, R., Summers, K., MacManes, M. D. (2021). The genomics of mimicry: Gene expression throughout development provides insights into convergent and divergent phenotypes in a Müllerian mimicry system. Molecular Ecology, 30: 4039-4061. https://doi.org/10.1111/mec.16024. The above article, published online on 19 June 2021 in Wiley Online Library (wileyonlinelibrary.com), has been retracted by agreement between the authors, the journal Editor in Chief, Loren Rieseberg and John Wiley and Sons Ltd. The retraction has been agreed due to the authors' discovery post-publication that they received a combination of Ranitomeya imitator genomic reads and rat genomic reads, which were supplied by a sequencing facility. Following the discovery of the error, the authors informed the journal editors and have re-assembled and re-annotated the supplied genome, re-analysed the repeat content, and rerun their gene expression analyses with the intent of sharing the corrected results. While the results from the gene expression analyses are largely consistent, the correction needed to amend the version of the record requires significant alterations to the published article, which requires the journal to issue a retraction.