Perhaps the current number of Sumatran tigers is no more than 500, so according to WWF the species is one of the six tiger sub-species that survive to date and is included in the classification of critically endangered animals or endangered species. Sumatran tiger skin color is the darkest of all tigers, ranging from reddish yellow to dark orange. Its body is also relatively small compared to all the species of tiger that live today. The narrowness of habitat width due to land clearing activities, making them increasingly threatened with extinction.