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. 2023 Feb 7;6:154. doi: 10.1038/s42003-023-04532-8

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© The Author(s) 2023

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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Fig. 1 — a An example of the phenotypic gradient observed in the two species and their hybrids. Phenotypically pure Baltimore Orioles are in blue and phenotypically pure Bullock’s Orioles are in orange. Illustrations by Megan Bishop, 2019. This image is the property of Cornell University. b Sampling locations for the individuals sequenced for this study. The range of both the Bullock’s (orange) and the Baltimore (blue) oriole is shaded on the map. c PCA of 55 resequenced individuals based on 11.6 million SNPs. Individuals are colored by plumage score. Black circles indicate individuals sampled outside of the hybrid zone. d ADMIXTURE plot (K = 2) for re-sequenced males. ADMIXTURE analyses were run using a filtered dataset (110,621 autosomal) that contained no missing data and was pruned to avoid linkage.