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Koalas are marsupials native to Australia, known for their specialized diet consisting mainly of eucalyptus leaves. They possess unique adaptations such as a large cecum to ferment the tough plant material and a strong thumb-like grip to navigate through trees. As a member of the Mammals category, koalas share characteristics with other mammals, including being warm-blooded, having hair or fur, and nursing their young with milk. Within the Animals by Taxonomy hierarchy, koalas belong to the Phylum Chordata, Class Mammalia, Order Diprotodontia, Family Phascolarctidae, and Genus Phascolarctos. Koalas' distinct features and taxonomic placement justify their unique position under the broader categories of Animals, Animals by Taxonomy, and Mammals.