In Koala's Big Day, a baby koala travels with his mother and the other koalas to a gum tree that has enough leaves for everyone. The koala is unique to Australia. It lives in eucalypt forests in eastern Australia, and eats only gum leaves. Gum leaves are low in energy content, so koalas spend up to 20 hours a day sleeping. A baby koala, called a joey, stays in its mother's pouch for 6 months, drinking its mother's milk. It later rides on her back until it is about 12 months old.