As the largest cat in the world, the Siberian tiger averages about 3.3 m (11 ft.) in length, with a tail measuring 1 m (3 ft.). Adult male tigers can weigh up to 320 kg (700 lb.), while female tigers are significantly smaller, weighing up to 180 kg (400 lb.).
Siberian tigers are distinguishable by their striped fur. Similar to people's unique fingerprints, no two tigers have the same striped pattern. Siberian tigers differ from other tigers because they have fewer, paler stripes, and they also have manes. The mane, in addition to their thick fur, helps keep them warm.
There are only 400-500 Siberian tigers left in the world, and they are considered endangered by IUCN's Red List. One cause of their dwindling population is loss of habitat due to deforestation. In addition, Siberian tigers are poached, or illegally hunted, for their fur and for body parts that are used for traditional medicines.
Efforts have been made to curb poaching of tigers and to protect tiger habitats. Many countries, including the United States, have created laws that outlaw the importation and selling of tiger parts. There are also breeding programs to help sustain the tiger population.
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