Díaz Rodríguez, MikelBal García, HugoDíaz Rodríguez, MikelIbáñez Encinas, ÁlvaroLombera Hermida, ArturoMosquera Castro, TaniaFábregas Valcarce, Ramón2026-05-212026-05-212026-04-08Bal-García, H., Brown, S., Rey-Rodríguez, I., Díaz-Rodríguez, M., Fernández-Rodríguez, C., Ibáñez-Encinas, Á., de Lombera-Hermida, A., Mosquera-Castro, T., Rodríguez-Álvarez, X., & Fábregas-Valcarce, R. (2026). Expanding the Faunal Interpretation of the Cova Eirós (NW Iberia) Middle Paleolithic–Early Upper Paleolithic Record With ZooMS. International Journal of Osteoarchaeology. https://doi.org/10.1002/OA.701071047-482Xhttps://hdl.handle.net/10347/47327The Cova Eirós archaeopaleontological site preserves the most comprehensive archaeostratigraphic sequence in the northwestern Iberian Peninsula, with an exceptionally rich record spanning from the Mousterian to the Upper Paleolithic. The extensive fragmentation of the faunal record and the rich taxonomic diversity at this site have limited the identifiability of the remains and led to an overrepresentation of the main taxa (Ursus spelaeus and Cervus elaphus). To refine our understanding of the site's faunal composition and to explore the subsistence strategies of both Neanderthal and Anatomically Modern Human (AMH) groups, we compared the results of traditional morphological analyses with those obtained through the application of Zooarchaeology by Mass Spectrometry (ZooMS) to the indeterminate fraction of the assemblage. While overall congruent with morphological identifications, the ZooMS data reveal two significant trends: firstly, a marked decrease in the relative abundance of Ursus spelaeus, previously overrepresented due to the prevalence of deciduous teeth; and secondly, an increased representation of large ungulates compared to that identified through conventional methods. The inclusion of specimens showing clear evidence of anthropogenic modification reduces the apparent dominance of C. elaphus, suggesting a more diversified subsistence strategy. The integration of paleoproteomic and morphological approaches thus provides a more nuanced reconstruction of the paleoenvironment and dietary patterns of the hunter-gatherer groups occupying the Eastern Mountains of Galicia during the middle to late phases of MIS 3.eng© 2026 The Author(s). International Journal of Osteoarchaeology published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly citedAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/AurignacianCova EirósIberian PeninsulaMousterianPaleoproteomicsZooarchaeology550405 Prehistoria2402 Antropología (física)550501 Arqueología2416 Paleontologíajournal article10.1002/oa.701071099-1212open access