法考拉抱树有助身体散热 Hugging trees helps koalas to keep cool, a study has revealed. 一项研究发现,抱着树木有助于考拉保持凉爽。 Thermal images revealed how cool the trunks of large trees were In a study published in the Royal Society journal Biology Letters, scientists used thermal cameras to reveal that, in hotter weather, the animals moved to the lower, cooler parts of the trees. They also pressed their bodies even closer to the trunks. The team, led by researchers from the University of Melbourne, was studying how koalas regulated their temperature. This is part of a wider research project investigating the effect of climate on land-dwelling animals in Australia, a country which experienced an extreme heat wave earlier this year. While PhD student Natalie Briscoe was studying the koalas behaviour, she noticed that in the winter the animals would stay high in the trees - up near the leaves feeding. In the hotter summer weather though, they would move down. Dr Michael Kearney from the University of Melbourne explained: They d just flop over the [lower] tree trunks. It looked like they were spread-eagled and uncomfortable; it seemed like the wrong thing to do. But measurements of the temperatures of the tree trunks showed that, on days as hot as 39C, they were up to seven degrees cooler than the air. That s what made us wonder if the koalas were using the trees as a heat sink, said Dr Kearney. The team used a thermal camera to take pictures of koalas on a particularly hot day. When we got the images, back it was so obvious what the koala was doing, explained Dr Kearney. You could see the koala sitting on the coolest part of the tree trunk with its bottom wedged right into the coolest spot. If we had thermal vision, it would have been an obvious thing.
北师大版七年级上册英语寒假作业答案
嘎吉初三家庭作业英语专题
人教版七年级上册英语寒假作业答案2016年
2016年七年级上学期英语寒假作业答案
江苏省宿迁市泗洪县初三家庭作业英语专题
2016年初一上册英语寒假作业答案参考
七年级上学期英语寒假作业答案(快乐寒假)
七年级上册英语寒假作业答案:2016年
初一年级上册英语寒假作业答案参考2016
2016年七年级英语寒假作业答案:第一学期
2016年七年级上册英语寒假作业答案
东省增城市初三家庭作业英语专题
人教版初一上册英语寒假作业答案参考
嘉鱼县九年级英语同步家庭作业
2016年初一上学期英语寒假作业答案参考
初一年级上册英语寒假作业答案(寒假乐园)
初一年级英语寒假作业答案参考(外研版)
寒假乐园:七年级上册英语寒假作业答案参考
(湘教版)初一上学期英语寒假作业答案
初一年级英语寒假作业答案:2016年
苏教版初一年级英语寒假作业答案
七年级上学期英语寒假作业答案必备
2016年七年级上册英语寒假作业答案
必备的七年级上册英语寒假作业答案
寒假大串联:初一上册英语寒假作业答案参考
(寒假大冲刺)初一上册英语寒假作业答案
寒假乐园:初一上册英语寒假作业答案
外研版2016初一上册英语寒假作业答案
2016年初一年级英语寒作业答案
经典九年级英语同步家庭作业
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |