The koala is a marsupial native to Australia, known for its distinctive appearance with large ears and a stout body. They primarily inhabit eucalyptus forests, where they spend most of their time in trees. Koalas are herbivores, feeding mainly on eucalyptus leaves, which provide them with the necessary nutrients despite being low in calories. Koalas are nocturnal animals, meaning they are most active at night. They have a slow metabolism and can sleep up to 18 hours a day to conserve energy. Due to habitat loss and disease, koala populations are currently facing threats, leading to conservation efforts to protect their natural environment.