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A red-listed species is a species that is classified as threatened or at risk of extinction due to various factors such as habitat loss, invasive species, overexploitation, or climate change. Red-listed species are identified and tracked by the International Union for Conservation of Nature (IUCN) and other conservation organizations. When a species becomes endangered, it can have ripple effects on the other species in the ecosystem.  The IUCN uses criteria to evaluate the extinction risk of species and assigns them to one of nine categories: Extinct, Extinct in the Wild, Critically Endangered, Endangered, Vulnerable, Near Threatened, Least Concern, Data Deficient, and Not Evaluated. The red list is used to help prioritize conservation efforts and to raise awareness about the plight of threatened species.  Species are assessed and assigned to one of several categories, including "critically endangered," "endangered," and "vulnerable," based on a variety of factors, such as population size, habitat loss, and levels of exploitation. By identifying and prioritizing species that are at high risk, conservation efforts can be targeted where they are needed most. The effects of a species becoming endangered can be wide-ranging and can have significant impacts on both the environment and human communities.