Why do koalas sleep in trees and not tumble down? It starts with diet. Eucalyptus leaves offer poor calories and demand long digestion. So koalas conserve energy by resting high among the branches. They choose trunks and forks that support their weight and keep them away from ground threats.They also cling with intent. Strong forelimbs, hooked claws and rough pads give koalas a reliable hold. A ty...More