conductivity of that fur and the surface area of the fur touching a tree (among other factors), they calculated that a 25-pound male koala could shed 68 percent of its excess heat on a 95-degree day by hugging a cool tree in a shady spot.]]> invertebrates during hot weather," they wrote.]]> ventured higher up in the tree and farther out onto the branches.]]> ingenious strategy for chilling out, and koalas probably aren't the only animals that realize it, the researchers wrote.]]> plausible, they came up with an equation to determine just how much heat a koala could dissipate by hugging a cool tree.]]> excess heat on a 95-degree day by hugging a cool tree in a shady spot.]]> preferences for high or low branches.]]> strategy for chilling out, and koalas probably aren't the only animals that realize it, the researchers wrote.]]> exposed more of their surface area.]]> species of trees - three eucalyptus and one acacia - at the peak of summer.]]> appealing in different seasons?]]> scarce.]]>