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In Images: Koalas Hugging Trees

Keeping cool

koala closeup

(Image credit: CBriscoe)

A 2014 study has found that koala bears hug trees to keep cool.

Cooler trunks

koala in tree

(Image credit: SGriffiths)

On hotter days, the trunks can be several degrees cooler than the ambient air temperature, and the koalas drape their whole bodies on the cooler branch.

Koala bears

male koala

(Image credit: CBriscoe)

Here, a male koala bear perches on a tree branch. On cooler days the marsupials don't cling so tightly to the branches.

Cooler trunks

koala and tree in infrared

(Image credit: SGriffiths)

Here, an image shows the temperature difference between the koala bear and the tree it is resting on.


koala in infrared camera

(Image credit: SGriffiths)

A koala hugs a tree to keep cool.

Avoiding panting

koala and tree in infrared

(Image credit: S. Griffiths)

Koalas pant in order to cool themselves, but hugging cool tree trunks means they don't have to waste precious water panting.

Climate change

koala on tree branch

(Image credit: KHandasyde)

The findings could have implications for how the koala's distribution will change with climate change, the researchers said.

Tia Ghose
Tia has interned at Science News,, and the Milwaukee Journal Sentinel and has written for the Center for Investigative Reporting, Scientific American, and ScienceNow. She has a master's degree in bioengineering from the University of Washington and a graduate certificate in science writing from the University of California Santa Cruz.