考研英语阅读篇章: 法考拉抱树有助身体散热
阅读基础如滴水穿石，连载考研英语阅读篇章，希望大家能保持阅读好习惯。考研英语阅读篇章：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 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."
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