The Amur, or Siberian, tiger is the world's largest cat species. It is a massively built animal with a rounded head, muscular body, and powerful limbs. Sadly, the Amur tiger is an endangered species, according to the IUCN Red List of Threatened Species. Illegal killing or poaching, and habitat loss threaten wild populations. Tiger body parts are in high demand in all of Asia for fur and medicines, putting the Amur tiger in serious danger of extinction.