Global

This global assessment represents the world's most critically endangered species across all major taxonomic groups, with all 1,573 assessed species classified as Critically Endangered according to the IUCN Red List 2025. The dataset encompasses species from diverse biomes including tropical rainforests, coral reefs, freshwater systems, grasslands, marine environments, and temperate forests. Invertebrates dominate the assessment, comprising 972 species (62%), with other_invertebrates representing the largest group at 635 species, followed by amphibians at 403 species. The complete classification of all assessed species as critically endangered indicates these represent the planet's most imperiled biodiversity. While specific threats were not assessed in this dataset, the taxonomic distribution suggests widespread ecosystem degradation across terrestrial, freshwater, and marine environments. The high representation of amphibians reflects their particular vulnerability to environmental changes, while the substantial invertebrate component highlights often-overlooked biodiversity loss. Marine taxa including corals, molluscs, and crustaceans represent critical ecosystem engineers facing unprecedented pressures. The mammalian and avian components, though smaller numerically, likely include flagship species essential for ecosystem function. This assessment underscores the global biodiversity crisis, with species from every major habitat type requiring immediate conservation intervention to prevent extinctions.