Studer, A., Sousa, M.C., Stoudmann, G. and Vieira Santos, N. 2025. Reproduction and natural history of the Yellow-faced Siskin Spinus yarrellii in northeastern Brazil. Biodiversity Observations. 15, 1 (Jun. 2025), 82–90. DOI:https://doi.org/10.15641/bo.1808.