The Amur tiger is one of the rarest large mammals on Earth.

东北虎是地球上最为珍稀的哺乳动物之一。

Amur tiger is one of the most endangered species in the world.

东北虎是世界上最濒危的野生动物物种之一。

During different phases, there were clear variations in behaviors of Amur tiger.

结果表明,在繁殖期的不同阶段东北虎的行为发生较大的变化.

The results show that: various behavioral models of captive Amur tiger are more regular.

结果表明：笼养东北虎的各种行为模式具有较强的规律性。

C There was no obvious difference in the behaviour of the same kittening Amur tiger between different years.

不同年份同一东北虎个体产仔行为无明显差异。