Koalas are medium-sized, grey and white marsupials that live in trees in Australia. They have small eyes, big noses, and breathe with lungs. Koalas are omnivores that primarily eat eucalyptus leaves, consuming around 1 kg per day. They reproduce through viviparity, with baby koalas developing and nursing in their mother's pouch for the first 6 months. Koalas live throughout various forests and woodlands in Australia, using trees to stay safe from predators by having food and shelter high off the ground.