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Marova, I., Ivanitskii, V., Ilina, I., Pecheneva, A., Kvartalnov, P., Belocon, Y. and Belokon, M. 2024. A new contact zone in the Chiffchaff distribution range: Caucasian and European subspecies meet each other in the south of Russia. Ornis Fennica. 101, 1–2 (Mar. 2024), 00–00. DOI:https://doi.org/10.51812/of.131719.