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Tree kangaroos are elusive and make their homes high up in the dense moss covered canopy.
树袋鼠是难以捉摸的，因为它们把自己的家建在茂密的苔藓覆盖的树冠上。
You can walk right underneath one and never know it's there.
你可能走在它的正下方，却永远不会知道它的存在。
They are perfectly camouflaged.
它们伪装得很好。
And you cannot actually observe their behavior directly, which is, as an animal behaviorists, is very frustrating.
你无法直接观察它们的行为，对动物行为学家来说，这是非常令人沮丧的。
But we can figure out different ways.
但我们可以换种方法。
We've used this "Critter-cam" method of having them videotape themselves so we can look at their feeding behavior.
我们用“动物摄像机”的方法让它们给自己录像，这样我们就能看到它们的进食行为。
We use radio collars to study their home range.
我们用无线电项圈来研究它们的活动范围。
So there's a variety of ways to get into the life of a tree kangaroo.
所以有很多方法可以进入树袋鼠的生活。
