Depending on the subspecies, the head to body length of a tiger can be about 4 to 9 feet. The length of the tail is 3 to 4 feet. The night vision of tigers is six times better than that of a human. Tigers mark their territories by spraying bushes and trees with a speical mixture of urine and scent gland secretions. They also leave scratch marks on trees.
Tigers use their tails to communicate with other tigers.
At the beginning of the 20th century, there were 100,000 wild tigers. Today only about 5,000 to 7,000 tigers live in the wild. Tigers live from southeastern Russia, where the Siberian tiger lives, to India, home of the Bengal tiger. Siberian tigers are the largest of all tigers. The lightest type of tiger is the Sumatran, with males weighing about 250 pounds and females around 200 pounds.