Verified answer

Eucalyptus leaves are very fibrous and low in nutrition, and to most animals are extremely poisonous. To cope with such a diet, nature has equipped koalas with specialised adaptations. A very slow metabolic rate allows koalas to retain food within their digestive system for a relatively long period of time, maximising the amount of energy able to be extracted. At the same time, this slow metabolic rate minimises energy requirements and they will sleep for up to 18 hours per day in order to conserve energy.

Each koala eats approximately 200 to 500 grams of leaves per day. The teeth are adapted to deal with for this. The sharp front incisors nip the leaves from the branches and the molars(back teeth) are shaped to allow the koala to cut and shear the leaves rather than just crush them. A gap between the incisors and the molars, called a 'diastema', allows the tongue to move the mass of leaves around the mouth efficiently.

The panda is a carnivore that acts like a herbivore. The panda diet is almost 100% vegetarian, but since it can digest plant material as efficiently as a goat or a cow, it makes up for this inefficiency by eating very large amounts of bamboo.

Giant pandas can eat most of the bamboo species found in their habitat. Although most giant pandas depend on about 10 kinds of bamboo, they can eat more than 40 different species of the plant.

Los animales que sólo comen un tipo de alimento que se conoce como especialistas. Debido a la evolución, que han llegado a ser más adecuados para comer algo específico, como eucalyptis y bambú.