Endemic Bird Areas

More than one quarter (2561) of the world's bird species, including more than 70% of the threatened birds, have a range restricted to less than 50,000km2. Virtually all these occur within the 218 Endemic Bird Areas (EBAs) defined by BirdLife International21. The world's EBAs are shown on this map categorised 1, 2 or 3 according to increasing biodiversity importance (based on the number of restricted range species, whether shared between EBAs, taxonomic uniqueness, and EBA size).
Source: data provided by BirdLife International, and see Stattersfield
Stattersfield, A.J. et al. 1998. Endemic bird areas of the world. BirdLife International, Cambridge, UK.