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We document from the state of Rio de Janeiro, Brazil, the first record of  Microspingus cinereus  (Bonaparte, 1850), which was observed in the municipality of Barra Mansa in October 2020. The species was originally documented in central Brazil, potentially linked to Cerrado habitats. However, recent observations from eBird and WikiAves databases indicate that  M. cinereus  has been spreading towards the southeast for several years. It has been considered Vulnerable for almost two decades due to the loss of grassland habitats. Our discovery expands the known geographic range of  M. cinereus  to eastern Brazil and may have importance for future biogeographic studies and the conservation of this species.

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First record of  Microspingus cinereus  (Bonaparte, 1850), Cinereous Warbling Finch (Passeriformes, Thraupidae), from the state of Rio de Janeiro, Brazil