Is there a list with all the endangered species? of animals online? please help If you%26#039;re more interested in scientific classifications than legal ones, the most authoritative list of endangered and threatened species worldwide is the Red List of Threatened Species maintained by the World Conservation Union (IUCN). You can view the Red List at www.redlist.org. An even larger list can be found at the website of the Convention on International Trade in Endangered Species (www.cites.org), which lists more than 25,000 species of plants and animals. Despite its name, however, and its global applicability, CITES doesn%26#039;t contain all threatened and endangered species, only those that may be affected by trade. For most purposes, the FWS and IUCN Redlist sites are better.