Koalas are considered arboreal (tree dwelling) mammals however they do descend to the ground to move from one tree to the other. Being mostly nocturnal, a koala will spend most of its time sleeping in branches throughout the day and feed mostly at dusk (they sleep for around 18 hours each day). Although koalas are mostly active at night, they will move around during the day. They will move if they are disturbed, if they are too hot, too cold or simply to find a new feed tree. During the day, they tend to move mid-morning (10am-11am) and late afternoon (3pm-4pm).
Koalas are mainly solitary animals except during the mating season. They communicate through a variety of calls consisting of bellows, grunts and low pitched snarls. These calls are often heard during the mating season.