Giant Koala
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General Information
Universe Real Life
Classification Phascolarctos stirtoni
Species Type Koala
Homeworld Earth
Environment Kati Thanda and Tarkarooloo Basins
Intelligence Non-Sapient
Biochemistry Carbon-based lifeform
Biological Information
Reproduction Sexual; give live birth
Average Weight 29-66 lbs (13-30 kg)
Locomotion Quadrupedal
Feeding Behavior Herbivorous
Prey Eucalyptus (presumed)
Predators Human (presumed)
Lineage Information
Subspecies Koala, Phascolarctos maris, Phascolarctos yorkensis
Related Species Dropbear, Komala
Cultural Information
Alignment Neutral
Organization Solitary
Sociocultral characteristics
Scientific Taxonomy
Planet Earth
Domain Eukaryota
Kingdom Animalia
Subkingdom Eumetazoa
Infrakingdom Bilateria
Superphylum Deuterostomia
Phylum Chordata
Subphylum Vertebrata
Infraphylum Gnathostomata
Superclass Tetrapoda
Class Mammalia
Infraclass Marsupialia
Order Diprotodontia
Family Phascolarctidae
Genus Phascolarctos
Species stirtoni
Other Information
Status Extinct

Giant Koalas (Phascolarctos stirtoni) were a species of arboreal marsupials that coexisted with the Koala during the Pleistocene epoch, known to have been indigenous to both the Kati Thanda and Tarkarooloo Basins of South Australia. In life, they would have been hard to discern from regular Koalas due to their clear similarities in physical appearance.

Although considered to be the largest tree-dwelling marsupial to have ever lived on Earth, the name "giant" is a bit of a misnomer. Like the Dire Wolf, the Giant Koala was no giant but instead just a more robust creature than the modern-day Koalas they filled the same arboreal niche with. Weighing in at between one-third and twice that of a Koala (29-66 lbs or ~13-30 kg) - the lower end of this scale is the same weight as a typical male koala. Even so, they are still considered to be part of Australia's former megafauna despite not fitting the formal definitions of such.

It is possible that the two species were able to coexist due to eating different food, though it is generally assumed they were folivores that ate Eucalyptus leaves, too.


The Giant Koala went extinct 50,000 years ago. While it is not exactly sure what killed off one species of koala and not the other, hypotheses suggest a sudden change in climate, the restriction of food supply, or selective hunting by the ancestors of Humankind.

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