Tree Use by Individual Koalas in a Natural Forest

The home ranges and species of trees used by 20 koalas (Phascolarctos cinereus) were determined in a forest in Victoria containing 6 Eucalyptus spp. Eight animals showed a preference for a tree species from those available within their home ranges. Four koalas preferred E. viminalis, 2 E. ovata and 2 E. macrorhyncha. Preference for tree species was detected only where the preferred species was in low abundance within the animal's home range. These observations confirm that koalas may show individual differences in the species of food trees they prefer. E. viminalis, the preferred species of this population, was the predominant tree species within the home range of 15 of the koalas, which may account for the lack of evidence of preference in the majority of animals.