No. This is a myth.
Eucalyptus leaves are low in nutrition, and although the koala has a digestive system which can utilise all the nutrients in the best way, the leaves do not give them much energy. Hence, they spend so much time asleep, which has given rise to the myth that koalas get "high".
The staple diet of koalas is Eucalyptus leaves. They will only eat approximately 20 different species of eucalyptus.
Koalas feed mainly on eucalyptus leaves so their diet is herbivorous. See also the related question.
1. Koalas are not mean.2. Eucalyptus leaves do not make them high - this is a complete myth.
Koalas can live in eucalyptus trees which reach anywhere between 10 and 50 metres high. They are capable of climbing very high.
Koalas eat a diet of eucalyptus leaves. Most animals are unable to do this because the leaves are poisonous. The back molars of Koalas are also different, in that they are shaped to permit cutting and sawing.
Not any more. Koalas were once killed for their fur, as koalas fur was in high demand overseas. Koalas are now protected by law, and it is illegal to hunt them for any reason.
Koalas have incisors to cut the gum leaves off the tree and molars to grind the leaves. The front teeth of a koala are small and sharp in order to nip off the eucalyptus leaves which form the main component of their diet. The back teeth are larger and specially shaped to break down the tough eucalyptus leaves further.
The diet of Koalas is made up almost completely of eucalyptus leaves.
Eat mainly near-toxic leaves as their main diet.
Koalas spend up to 20 hours per day sleeping and the rest eating, due mostly to their low nutritional diet of eucalypt leaves.
Neither. Koalas do not eat fruits such as these. They feed almost exclusively on the leaves, buds and flowers of specific species of eucalyptus trees. Koalas select from just 14 species as their primary food source, specifically, the subgenus Symphyomyrphus.
No. Koalas are strictly herbivorous, feeding almost exclusively on eucalyptus leaves. They do not eat any animal proteins at all.