Koalas are not bears; they are actually quite nice most of the time. They sleep a lot because they mainly eat eucalypt leaves which are toxic to most animals and kind of crappy in terms of nutrients. So the koalas sleep to conserve energy. Plus, if you lived in Australia and wore a fur coat, you’d probably sleep a lot, too. They are in the elite class of animals known as Marsupials. Marsupials live primarily in the Southern Hemisphere, like Australia, and have pouches where they carry their babies. They always have change in their pouches for vending machines and are happy to lend you a mirror to check and see if you have any leaves in your teeth.