Tigers are apex predators and have no natural enemies. Human-related activities such as poaching, habitat fragmentation and habitat destruction remain the biggest threats to the existence of tigers worldwide.
Tigers are the largest species of cats in the world, capable of reaching over 11 feet in length and weighing nearly 900 pounds, in the case of the Siberian tiger. The former range of tigers included much of Asia, although it has been reduced to the Siberian taiga and parts of East Asia. The tiger is a solitary animal and requires large amounts of territory, which it defends from other tigers of the same sex. The life expectancy of a tiger is approximately 15 years in the wild and 20 years in captivity.