Updated checklist of the birds of São Paulo State, Brazil

In southeastern Brazil, the state of São Paulo hosts more than 40% of the country’s bird diversity. Despite detailed documentation of its birdlife since the late 19th century, new species are still being recorded, and more than ten years have passed since the last comprehensive list was published. In this context, we reviewed all available ornithological records for the state and present an updated checklist here. A total of 890 valid or potentially valid forms has been recorded, including 864 species, with 860 supported by evidence and 76 new additions since the previous list. We highlight the importance of conserving the remaining native vegetation in São Paulo, considering the high number of bird species that are threatened or already extinct in the state and the ongoing human pressures they face. Additionally, we discuss the distribution, conservation status, and misidentifications or invalid records related to the state.