Though they live only in Australia, koalas are one of the most popular animals in the world.They're also very unusual.Koalas spend almost their entire lives high in the branches of eucalyptus trees, hardly ever drink water, and sleep eighteen hours a day.But the future of these cute and cuddly marsupials is uncertain, as more and more eucalyptus forests are cut down to make room for people.Learn about the daily lives of these fascinating animals and...