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Living on Earth

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The Evolution of Koalas

Eucalyptus is the dominant tree type in Australia. It's difficult for animals to exploit, especially mammals because their leaves are very tough and fibrous. And they're also got a lot of toxins in them. So koalas have an incredibly complex digestive system that helps them digest this plant. They can only eat between three and ten different species per season. Koalas are extremely resistant to medications such as chlamydia.

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