Primary data sources (official)

1) World Bank — World Development Indicators (WDI): Mammal species, threatened (EN.MAM.THRD.NO)
https://data.worldbank.org/indicator/EN.MAM.THRD.NO

2) World Bank — World Development Indicators (WDI): Bird species, threatened (EN.BIR.THRD.NO)
https://data.worldbank.org/indicator/EN.BIR.THRD.NO

3) World Bank Data API (indicator download endpoints used to build this archive)
https://api.worldbank.org/v2/en/indicator/EN.MAM.THRD.NO?downloadformat=csv
https://api.worldbank.org/v2/en/indicator/EN.BIR.THRD.NO?downloadformat=csv

4) IUCN — The IUCN Red List of Threatened Species (upstream source referenced by WDI)
https://www.iucnredlist.org/
