The threatened status of plants and animals is one of the most widely used indicators for assessing the condition of ecosystems and their biodiversity. It also provides an important tool in priority-setting exercises for species conservation. At the global scale the best source of information on the conservation status of plants and animals is the IUCN Red List of Threatened Species. The Red List provides taxonomic, conservation status, and distribution information on taxa that have been evaluated using the IUCN Red List Categories and Criteria: Version 3.1. This system is designed to determine the relative risk of extinction, with the main purpose of cataloguing and highlighting those taxa that are facing a higher risk of extinction (i.e. those listed as Critically Endangered, Endangered and Vulnerable).