![Kangaroos can't sweat, so when they're too hot they lick their forearms - which contain a network of blood vessels close to the surface of the skin - to cool off. : Kangaroos can't sweat, so when they're too hot they lick their forearms - which contain a network of blood vessels close to the surface of the skin - to cool off. :](http://i.imgur.com/7bBB3TS.jpg)
Kangaroos can't sweat, so when they're too hot they lick their forearms - which contain a network of blood vessels close to the surface of the skin - to cool off. :
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