Area of Habitat maps for the world's terrestrial birds and mammals

Area of Habitat (AOH) is 'the habitat available to a species, that
is, habitat within its range'. It complements a geographic range map
for a species by showing potential occupancy and reducing commission
errors. AOH maps are produced by subtracting areas considered unsuitable
for the species from their range map, using information on each
species' associations with habitat and elevation. We present AOH maps
for 5,481 terrestrial mammal and 10,651 terrestrial bird species
(including 1,816 migratory bird species for which we present separate maps
for the resident, breeding, and non-breeding areas). Our maps have a
resolution of 100 m. On average, AOH covered 66±28% of the range maps for
mammals and 64±27% for birds. The AOH maps were validated independently,
following a novel two-step methodology: a modeling approach to identify
outliers and a species-level approach based on point localities. We used
AOH maps to produce global maps of the species richness of mammals, birds,
globally threatened mammals, and globally threatened birds.