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The distribution of undescribed amphibian and land mammal species across global biome-realms. Shown are the number of undescribed (a) amphibian and (c) mammal species, and the percentage of undescribed (b) amphibian and (d) mammal species, as predicted from our model. Estimates are not available for the biome-realms coloured grey owing to a low sample size (n < 20) or the lack of model convergence. The maps have a cylindrical equal-area projection.
