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.
ASSOCIATED PRESS
The Toledo Zoo has four Amur tigers with the addition of these two cubs born in September to mother Marta.
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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