The australian mammal spends most of its life in trees is the koala, Koalas survive on a diet of eucalyptus leaves and can eat up to a kilogram a day.
Mammals are a group of animals (vertebrates) that have backbones and hair or fur.
They are warm-blooded (endothermic), and they have four-chambered hearts.
They also feed their young with milk from the mother's body. The young of most mammals are born alive.
Thus, The australian mammal spends most of its life in trees is the koala.
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