In the language of Aborigines, the Australian natives, the word "koala" means "the one who does not drink water." Indeed, the koala does not drink water, for it feeds entirely on eucalyptus leaves. The eucalyptus leaves has a water content of around 40% to 65%.

This ratio never drops below 40%. Because plants with less than 40% water content dry up and die. Thanks to this feature, eucalyptus leaves provide the necessary amount of water to the koala. No doubt, this feature of the leaves is not sufficient alone.

The koala's body structure utilizing the water in the eucalyptus leaves is extremely important. The system in the kidneys that checks water loss of the koala's body has a flawless design. Yet, what is more important is the fact that the digestive system of the koala has the feature of holding water. This way, only a small amount of the water is thrown out from the koala's body.

Thanks to the kind of digestive system that can hold water, the koala can rely on excess amounts of leaves that do not contain high amounts of water. If the digestive system of the koala lacked this feature, then the animal had to be down on earth, being in a constant search for water. This means, the animal, which lacks proper features to survive anywhere except for trees, had to face many threats. However, thanks to its special bodily structure, the koala never meets such difficulties.

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