Koala

The koala may look cuddly, but watch out: it can give you a nasty bite or scratch.
Of all the marsupials, the koala has the most refined diet. It eats mainly eucalyptus leaves and then just the leaves from six of the 350 species of eucalyptus trees. It doesn’t eat young eucalyptus leaves, which are high in prussic acid. It only eats the old, rather indigestible leaves. Microorganisms in its digestive system help break down the coarse leaves. A koala drinks very little, because it gets enough fluid from the eucalyptus leaves. Around 4 hours a day are spent eating, and then it sleeps or dozes in the trees for the other 20 hours. The koala is the longest sleeper in the animal kingdom!

The pouch has the opening on the bottom. When the young koala is bigger, it hitches a lift on its mother’s back.