The koala has several adaptations

The koala has several adaptations for its eucalypt diet, which is of low nutritive value, of high toxicity, and high in dietary fibre.[45] The animal’s
dentition consists of the incisors and cheek teeth (a single premolar and four molars on each jaw), which are separated by a large gap (a characteristic feature of herbivorous mammals). The incisors are used for grasping leaves, which are then passed to the premo
lars to be snipped at the petiole before being passed to the highly cusped molars, where they are shredded into small pieces.[46] Koalas may also store food in their cheek pouches before it is ready to be chewed.[47] The partially worn molars of middle-aged koalas are opti
mal for breaking the leaves into small particles, resulting in more efficient stomach digestion and nutrient absorption in the small intestine,[48] which digests the eucalyptus leaves to provide most of the animal’s energy.[46] A koala sometimes regurgitates the food into the mouth to be chewed a second time.[49]