The mammal that sleeps the most in the world is the koala!

Le mammifère qui dort le plus au monde est le koala !

The koala sleeps between 18 and 22 hours every day, which makes ​​it the mammal with the longest sleep cycle in the world.

Given that its life expectancy is 15 years, this animal spends 12 years of it sleeping. And to top it all, it spends most of its waking hours eating.
What an exciting life!