There were once eight subspecies, but three (the Caspian tiger, Javan tiger and Bali tiger) became extinct during the 20th century. The five remaining subspecies are all considered endangered.

Fewer than 1,000 individual tigers are left in Sumatra and two subspecies — the Bali tiger (Panthera tigris balica) and the Java tiger (Panthera tigris sondaica) — have already been driven to ...