When another individual climbs

Adult males communicate with loud bellows—low pitched sounds that consist of snore-like inhalations and resonant exhalations that sound like growls.[75] These sounds

are thought to be generated by unique vocal organs found in koalas.[44] Because of their low frequency, these bellows can travel far through air and vegetation.[76] Koalas may bellow at any time of the year, particularly during the breeding season, when it serves to attract fem\\\

ales and possibly intimidate other males.[77] They also bellow to advertise their presence to their neighbours when they enter a new tree.[76] These sounds signal the male’s actual body size, as well as exaggerate it;[78] females pay more attention to bellows that originate from larger males.[79] Female koalas bellow, though more softly, in addition to making snarls, wails, and screams. These

calls are produced when in distress and when making defensive threats.[75] Young koalas squeak when in distress. As they get older, the squeak develops into a “squawk” produced both when in distress and to show aggression. When another individual climbs over it, a koala make

s a low grunt with its mouth closed. Koalas make numerous facial expressions. When snarling, wailing, or squawking, the animal curls the upper lip and points its ears forward. During screams, the lips retract and the ears are drawn back. Females bring their lips forward and raise their ears when agitated.[80]