Reptiles and grids
The gridding of reptile ranges (Figure S2c) is visible in all countries with high reptile diversity (especially tropical and hot areas). Using large (1 degree-111km) grids, the density boundaries included 19% of boundaries with 3-5 species and 63% of boundaries with >5 species. For all large-grid areas for all global landmasses, 4% have a minimum of three species boundaries in them, which is surprising as most of the globe is low diversity for species which have been mapped. Smaller (55km) grids include 27% of all boundaries with 3-5 species, and 71% of boundaries with five or more species, but is only equivalent to 2.1% of all small grids across the planet. When this analysis is clipped to areas where three or more species are mapped to occur, these values inflate to 15% of all large grid area with at least three species, 8.3% for small (0.5o) grids.