The Sumatran tiger (Panthera tigris sondaica)[2] is a tiger population that lives in the Indonesian island of Sumatra. It was listed as Critically Endangered on the IUCN Red List in 2008, as the population was estimated at 441 to 679 individuals, with no subpopulation larger than 50 individuals and a declining trend. The Sumatran tiger is the only surviving population of the Sunda Islands' group of tigers that included the now extinct Bali and Javan tigers. Sequences from complete mitochondrial genes of 34 tigers support the hypothesis that Sumatran tigers are diagnostically distinct from mainland subspecies. In 2017, the Cat Classification Task Force of the Cat Specialist Group revised felid taxonomy and now recognizes the living and extinct tiger populations in Indonesia as P. t. sondaica (Wikipedia).