For the IUCN to add a species to the category it must meet any of the following criteria: Population Reduction. A taxon's population size is reduced by 70 percent or more over 10 years or three generations, whichever ... An endangered species is a species (a population) of animals, plants or other organisms that is in danger of becoming extinct.This could happen because there are few of that animal left, its predators have grown in number, or the climate that it lives in is changing, or the places it lives in have been destroyed.The World Conservation Union (IUCN) has worked out that endangered species are 40% ... The greater bamboo lemur (Prolemur simus) is one of the world's most endangered primates.
Threatened species are allocated to different wildlife classes depending on the degree of risk of their extinction. Why species become threatened There are many threats that impact on species and contribute to their risk of extinction. This is a list of threatened amphibians, birds, invertebrates, mammals and reptiles in the Northern Territory (NT).