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Koalas

Why do koalas sleep so much?

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May 23, 2011 9:52AM

Koalas have a slow metabolic rate which is required for them to digest the eucalyptus leaves on which they feed. Eucalyptus leaves are very fibrous and rather low in nutrition, so the fact that the koala has a slow metabolic rate means it can keep the food within its digestive system for as long as possible in order to maximise the energy that can be extracted from the leaves. This slow metabolic rate also means the koalas sleep for more time each day in order to conserve energy.