Today’s tiger populations are divided, stretching from Siberia temperate forest to tropical and subtropical forests in the Indian and Sumatra subcontinent. Deal Me In Florence First Nursing Student 1860. The tiger has been listed as an endangered species in the IUCN Red List since 1986. As of 2015, the global wild tiger population is estimated to be between 3,062 and 3,948 adult individuals, down by about 100,000 ( 95%) compared with the beginning of the 20th century, with most of the remaining populations occurring in small isolated areas. The main reasons for the decline in tiger populations include habitat destruction, habitat fragmentation and poaching. Tigers are often hunted for skin, bones, or other parts. This, along with the fact that they often live in some densely populated places on Earth, has caused significant conflicts with humans.