Figure S2. Common errors in different datasets. A-C show density of species range boundaries with increasing hue representing greater numbers of species share range boundaries. A. US Amphibian range boundaries, clearly showing county boundaries. B. Odonata boundaries, both highlighting the river boundaries (viewable globally) and National boundaries. C. Reptile range boundaries showing clear gridding. This image was taken from Africa, but the same patterns are present across the globe. D. Common errors across all datasets showing point buffering at variable distances and no consistent pattern.