How do koalas survive on eucalyptus leaves that are toxic to many animals?

Quick Answer

Koalas have a specialized digestive system that breaks down tough eucalyptus leaves and helps detoxify them. Their gut microbes play a major role in handling the plant’s chemical defenses.

The Full Story

Eucalyptus leaves are fibrous, low in nutrition, and filled with chemical compounds that many mammals cannot tolerate. Koalas have a long digestive tract and a large cecum that help ferment and process this difficult food. Microorganisms in their gut break down some of the toxins and extract usable energy from the leaves. Koalas also conserve energy by sleeping or resting for much of the day. This lifestyle lets them survive on a diet that would be unsuitable for most other mammals.

Key Facts

1.Koalas rely on gut microbes to digest eucalyptus

2.Their diet is low in energy and chemically defended

3.They rest for many hours a day to conserve energy

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