Fun fact #1: Koalas have two opposable thumbs on each front paw. Fun fact #2: koalas have fingerprints that are difficult to distinguish from human fingerprints. The koala's diet consists almost entirely of eucalyptus leaves. They have slow metabolisms and spend up to 18 hours a day sitting motionless or sleeping. And when you wear this adorable koala on your shirt, everyone will want to hug you!