According to the IUCN Red List of Threatened Species, the global authority on species' conservation status, one out of four of the world’s mammals and over 40 percent of amphibians are threatened with ...

The US Fish and Wildlife Service makes listing determinations for terrestrial species, while the National Marine Fisheries Service makes listing determinations for marine species. The ESA requires ...

The tropical forest biome is estimated to contain over half of the terrestrial species on Earth. Approximately 170,000 of the 250,000 described species of vascular plants occur in tropical biomes.