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The African elephants have longer lifespans than most other animals on earth. They can live 70 years or more. Yet they require very little sleep, only about 2 hours each day. They often sleep standing or leaning against a tree or rock.

In contrast, koalas sleep 22 hours each day. Their diet of eucalyptus leaves (high in toxins) requires a lot of energy to break down. Koalas have a lifespan of 12 years.

Despite having a much shorter lifespan, about how many more years of sleep does a koala have?
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