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The WWF, which describes itself as the world's leading conservation organization, reports that 93% of historical tiger habitats have completely disappeared because of human activity.
With habitat loss and poaching, tigers in the wild face several obstacles. Today, some 3,900 tigers live in the wild, according to estimates from the WWF. There were once eight tiger subspecies, but three are now extinct, leaving five subspecies, according to the US Fish and Wildlife Service.
Keep reading to celebrate International Tiger Day and explore the beauty of this endangered species.
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Siberian tigers are the world's largest cats and can weigh up to 660 pounds.
Siberian tigers.
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The Siberian tiger has thick, long fur that helps it survive harsh winters in its natural habitat.
A Siberian tiger.
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There are about 2,500 Bengal tigers in the wild, making them the most-populous tiger subspecies.
A Bengal tiger cub.
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Bengal tigers mostly live in India, and some live in mangrove forests called the Sundarbans.
Bengal tigers.
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Some Bengal tigers have a white-colored coat.
A white-coated Bengal tiger.
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The smallest-weighing tiger is the Sumatran tiger.
A Sumatran tiger.
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There are fewer than 400 Sumatran tigers left in the world, which has decreased from an estimated population of 1,000 in 1978.
The Sumatran tiger.
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In order to take accurate tiger population counts, scientists and researchers identify tigers by their stripes, which are unique to each individual.
A Bengal tiger.
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Tigers' tails can reveal the animal's emotions or motives.
Bengal tigers.
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Tigers stay with their mothers until they're about 2 years old.
Siberian, or Amur, tigers.
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When it comes to hunting for prey, tigers rely on their hearing and sight.
A Bengal tiger.
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Speaking of which, tigers can consume up to 75 pounds of food in one night, according to Smithsonian's National Zoo and Conservation Biology Institute.
Siberian tigers.
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Tigers' hind legs are longer than their front legs, allowing them to pounce forward up to 30 feet in one leap, according to Animal Planet.
A Siberian tiger.
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Their night vision is six times better than the night vision of humans, according to National Geographic.
A Sumatran tiger.
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In the US, it is estimated that around 5,000 tigers are kept in captivity, according to the WWF.
A Sumatran tiger.
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