Each Siberian tiger has its own large amount of territory.
Siberian tigers live alone and only come together in mating season.
Siberian tigers reach sexual maturity at four years of age.
The only consistent number on the documents is for the four Siberian tigers.
About 400 Siberian tigers remain in the wild, according to the conservation society.
It is estimated that there are around 400 to 500 Siberian tigers left in the wild.
Like other tigers, the Siberian tiger likes to live on its own.
A Siberian tiger could eat one hundred pounds of meat in a single sitting.
It is an important reserve for the endangered Siberian tiger.
By way of illustration, the Siberian tiger is becoming rare.
There are thought to be fewer than 500 Amur tigers left in the wild.
It's been a close call for the Amur tiger, but thanks to conservationists its numbers have grown from 50 in 1960 to around 500 today.
The number of Amur tigers in China is estimated at 18-22.
Amur tigers require 10 pounds of meat every day - the fresher the better.
They have traditionally been used for hunting large animals, including Amur Tigers.
Beautiful photographs of the Amur tiger - one of the the world's most endangered species.
A new male polar bear and male Amur tiger arrived at the park.
In December 1997, an injured Amur tiger attacked, killed and consumed two people.
There are now around 430 Amur tigers in the Ussuri nature reserve, up from just 30 before the war.
But so far, extensive timber harvesting has been encroaching on the habitat of Amur tigers.