Koalas are 1 of 3 mammals that can stay alive on just a diet of Eucalyptus leaves, how insane is that? I don’t even think it would be possible for me to think of one individual thing that I could only eat for the rest of my life. What is even crazier is that their metabolism is so low that they don’t have to eat very much because it stays in their digestive tract longer. Another reason they don’t have to eat a lot is because they sleep around 18-22 hours a day, so there is no physical exhaustion so they don’t lose to much energy. I mean they eating thing may be a bit difficult, but you can sign me up for sleeping all day, I’m down for that. An interesting fact about the gum trees that produce the eucalyptus leaves is that they actually are poisonous. The trees produce toxins inside the leaves to ward of leaf eating animals, and bugs. Although this is true, the koalas digestive system can actually counteract the toxins so that they can actually eat them. They sleep for over half the day, they can eat toxic leaves, and they’re adorable what more could you want?