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flag Wood warblers gained bright colors by swapping color genes across species through hybridization, a study found on December 11, 2025.

flag A new study published on December 11, 2025, reveals that wood warblers have exchanged color-related genes across species lines through hybridization, allowing them to rapidly acquire bright plumage traits. flag Researchers analyzed DNA from over 400 warblers across 100 species and found that genes like BCO2, involved in carotenoid pigment processing, were transferred between distantly related species. flag This horizontal gene flow, particularly involving genes for yellow, red, and orange feathers, suggests that species boundaries are more permeable than previously thought, enabling faster adaptation. flag The findings, based on whole-genome comparisons, highlight the role of introgression in shaping the vibrant diversity seen in wood warblers.

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