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Research Highlight: Delhey, K., Valcu, M., Dale, J., & Kempenaers, B. (2022). The evolution of carotenoid‐based plumage colours in passerine birds. Journal of Animal Ecology, https://doi.org/10.1111/1365‐2656.13791. Carotenoids, a class of colour pigments, are responsible for red, yellow and orange hues in nature. They play an important role in visual animals, and specially birds, where dietary...