Phascolarctos stirtoni
The giant koala is an extinct arboreal marsupial which existed in Australia during the Pleistocene epoch. Phascolarctos stirtoni was about one-third larger than the contemporary koala, P. cinereus, and has an estimated weight of 13 kg (29 lb), which is the same weight as a large contemporary male koala.

A. C. Tatarinov · CC0 · via Wikidata/Commons. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.
On record
Recorded, not inferred- Sits inside
- PhascolarctosPBDB
- Diet
- herbivorePBDB, for Phascolarctidae
- Life habit
- arborealPBDB, for Phascolarctos
- Motility
- actively mobilePBDB, for Osteichthyes
- Environment
- terrestrialPBDB, for Mammalia
Time the record covers
At least 2.8 million years on record.
The record covers at least 3.6 Mya to 774 ka. No occurrence read is dated outside 5.333 Mya to 11.7 ka.
3 occurrences of Phascolarctos stirtoni on record, most of them in the Pleistocene. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.
When
3 occurrences- Pliocene33%
- Pleistocene67%
These are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.
Found in
1 formation
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The named rock units Phascolarctos stirtoni has been recovered from, largest first. Drawn where the rock is now, not where it formed. 2 occurrences have no formation on record, which is common for older literature.
Phascolarctos stirtoni and its relatives
PleistoceneWhere Phascolarctos stirtoni and its relatives were recorded in the Pleistocene.
Found in the same rock
48 taxa- Macropus (Macropus) giganteus2 sites
- Palorchestes parvus2 sites
- Protemnodon brehus2 sites
- Sarcophilus laniarius2 sites
- Thylacinus cynocephalus2 sites
- Thylacoleo carnifex2 sites
- Thylogale2 sites
- Aepyprymnus rufescens1 site
- Antechinus1 site
- Baringa nelsonensis1 site
- Bettongia1 site
- Darcius duggani1 site
- Dasyurus viverrinus1 site
- Diprotodon optatum1 site
- Isoodon1 site
- Lasiorhinus1 site
- Latagallina naracoortensis1 site
- Macropus1 site
- Macropus (Notamacropus) dorsalis1 site
- Macropus (Notamacropus) parryi1 site
- Mastacomys1 site
- Nototherium mitchelli1 site
- Palorchestes azael1 site
- Palorchestes pickeringi1 site
The Paleobiology Database records 3 sites for Phascolarctos stirtoni, and this reads all of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.
This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.
Entered from
2 references- New Records of Plio-Pleistocene Koalas from Australia: Palaeoecological and Taxonomic Implications2
- Early Pleistocene mammals from the Nelson Baylocal fauna, Portland, Victoria, Australia1
Each of the 3 occurrences read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. Each entry links to doi.org. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.
Media and terms
Media content1

Picture of Phascolarctos stirtoni
- Source
- Wikidata/Commons
- Credit
- A. C. Tatarinov
- Licence
- CC0
- Commercial use
- the licence allows it
No 3D scan of Phascolarctos stirtoni was found in Sketchfab.
Smithsonian Open Access and MorphoSource were not reached for this taxon, so this list is what the others held rather than everything there is.
The description on this site
- Source
- Wikipedia, “Giant koala”
- Licence
- CC BY-SA 4.0
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itPhascolarctos through timeFormations of the PleistoceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Bartholomai 1968