Now, have you ever wondered why koalas hug trees? And apparently, according to a new scientific study it is to stay cool.That discovery was made by researchers from the University of Melbourne who were looking at how koalas regulate their body temperature.
目前，你们曾想过考拉为何喜欢抱树吗？依据一项新的科学研究，非常明显考拉抱树是为了维持凉快。这一发现是由墨尔本大学的研究职员提出的，他们研究了考拉怎么样调节他们的体温。
And one of my students Natalie Briscoe, her PHD was focused on this question in terms of the koala.
（Natalie Briscoe）是我的一个学生，她在博士期间专注于和考拉有关的一个问题。
And one of the questions we want to ask about the koala is, do they use behavior at all to regulate their temperature, are they able to choose places in their trees that make them a bit more comfortable.
也是一个大家都想问的问题，即考拉是不是要做出一些专门举动来调节体温呢，它们是不是能在树上选择一些让他们舒适一点的地方呢？
And how did you go about finding this out?
那样，你们是如何得出这一发现的呢？
Well, initially we went about this by putting a little weather station on a very long pole and lifting that weather station right up next to the koalas that we had radio transmitters on, and at the same time going around to other random places in their habitat and measuring the conditions in the trees of those locations.
是的，最初大家在一条很长的竹竿上安装了一座小型气象站，并举到考拉身边，在考拉身上也安装了无线电发射器。同时，随机测试考拉生活的地区其他树木的情况。
But what Natalie noticed was that the koalas in the hot weather would come down and will go to the thicker trunks.
但（Natalie）注意到的是在炎热的天气下，考拉会从树上爬下来，选择更粗的树干。
And they would flop onto those trunks and drop them limbs there.
他们会跳上去并抱住这类树干。
And we couldn't quite understand why they were doing that, but she also sought to measure the tree trunk temperatures and we found that they are actually quite a bit cool than the air.
大家最初不太理解为何它们要这么做，但她也测试到了树枝的温度，而且大家发现树枝的温度事实上稍稍低于气温。
And then we took a special kind of camera that takes pictures of heat and tells us the temperature of every service in the picture.
然后，大家使用特殊照相机，拍下热量的照片，显示出各种读数。。。
And it was so obvious once we got those pictures back.
大家有了这类照片就非常明确明了了。
What the koalas were doing? They were putting their bottoms into the trees and dumping all their excess heating to the tree.
卡拉在干什么？考拉的身体紧贴着树木是为了把多余的热量传给树木。
And were you surprised by what you found because it's known or presumably zoologists know that the fur on the stomach of the koalas is a lot thinner than it is elsewhere.
你们对这一发现感到吃惊吗，由于大家了解或者说动物学家了解，考拉腹部的皮毛要比它身上其他的部位薄得多。
Yeah, well, we knew that and we thought, well, maybe they, I guess one idea was that they just expose that during the hot weather so that heat comes out their chests into the air.
是的，大家了解。可能大伙会觉得，炎热的天气下考拉会把胸前的皮毛暴露在空气重，从而释放热量。
What we didn't realize was how much cooler the tree trunks were than the air temperature.
但大家并未意识到树干的温度要低于空气温度这一事实。
That wasn't obvious to us.
刚开始大家也没注意到。
It was obvious when we looked at the trees with the special camera, but it wasn't before that.
直到用相机察看树木才发现，之前是不明显的。
And then it made a whole lot of sense.
用相机后所有都讲解的通了。
And it's really surprised a lot of biologists.
这确实让很多的生物学家吃惊。
And it's always eucalyptus trees, is it?
考拉抱的树一直桉树吗？
No, it's not.
不，不是的。
And not all eucalyptus trees is good as each other for this purpose, so we measure a whole, a few different species of eucalypts in their habitat where we did the study and also another kind of tree called acacia.
不是所有桉树都合适考拉，所以大家在研究基地测试了考拉存活环境中几种不一样的桉树种类，而另一种树叫刺槐。
And it turned out that the acacia was actually the best one.
而事实上刺槐才是考拉的最好选择。
But they don't eat the leaves of the acacia trees, they only eat the leaves of the eucalypt trees.
但它们不吃刺槐树叶，只吃桉树叶。
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