The Amur tiger, seen here interacting with a zookeeper in Bucharest, Romania, are sometimes called Siberian tigers after the area they inhabit in eastern Russia.
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The Toledo Zoo has four Amur tigers with the addition of these two cubs born in September to mother Marta.
The Blade
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The Amur tiger once raged across a wide area of Siberia, eastern Russia, northeastern China, and the Korean peninsula.
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The Amur tiger gets its name from the Amur River that flows nearly 3,000 across Asia and forms a natural border between Russia and China.
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The canine teeth of an Amur tiger can be up to 5 inches long and are used for stabbing prey. They carnassial teeth behind the canines are used for slicing through muscles and tendons.
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The tongue of the Amur tiger is covered with file-like spines that are used to scrape the flesh and fur from its prey, or the snow from its paw as this captive cat is doing in Romania.
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Retractable claws are used to grip prey and scratch trees to mark territory. Amur tigers are the world's largest cats, even larger than their southern relative Bengal tigers.
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There are an estimated 200-400 Amur tigers in the wild and about 150 captive in in 53 U.S. zoos, like this one at the Como Park Zoo in St. Paul, Minn.
Associated Press