Multiple choice general knowledge The --- tiger is the biggest of the nine subspecies. None Siberian Bengal Malayan Reveal answer Fill a bubble to check yourself B Correct answer Explanation The Siberian tiger (also known as the Amur tiger) is the largest of all tiger subspecies. Adult male Siberian tigers can weigh over 300 kg and measure up to 3.3 meters in length, making them the biggest cats in the world.