1Indigenous Peoples' lands cover over one-quarter of the Earth's surface, a significant 2 proportion of which is still free from industrial-level human impacts. As a result, Indigenous 3 Peoples' lands are crucial for the long-term persistence of Earth's biodiversity and ecosystem 4 services. Yet, information on species composition within Indigenous Peoples' lands globally 5 remains unknown. Here, we provide the first comprehensive analysis of terrestrial vertebrate 6 composition across mapped Indigenous lands by using distribution range data for 20,328 7 IUCN-assessed mammal, bird and amphibian species. We estimate that 12,521 species (62%) 8 have ≥ 10% of their ranges in Indigenous Peoples' lands, and 3,314 species (16%) have >half 9 of their ranges within these lands. For threatened species assessed, 840 (18% of all threatened 1 0 mammals, birds and amphibians) occur in Indigenous Peoples' lands. We also find that 3,989 1 1 species (of which 418 are threatened) have