Figure 2.

Simulated and observed species richness patterns of all 1,596 breeding birds endemic to Africa. (A) Means of 100 runs of the area model: randomly scattered ranges for 1,596 species with range sizes drawn from observed data; values range from 209 (light) to 217 (dark) species. (B) Means of 100 runs of the geometric constraints model: continuous ranges with range sizes drawn from observed data; values range from 60 (light) to 312 (dark) species. (C) Observed data; values range from 3 (light) to 546 (dark) species. All values are shown in quantile classification.