From the AviList website.
The AviList team worked for four years to harmonize the global checklist of birds. The final product includes a consensus taxonomy combined with a full set of taxonomic and nomenclatural components, the details of which are explained at Components of the AviList checklist. Over time, additional information is expected to be added.
AviList is free for anyone to use and download in XLSX format. Note that each spreadsheet includes five tabs: AviList v2025; Decision summaries; Recommended citation; How to use; and References.
The Excel spreadsheet is in this repository, and the tabs have been extracted as TSV files for ease of use.
The original data is doi:10.2173/avilist.v2025 and is CC-BY 4.0.