Phascolarctos cinereus

Phascolarctos cinereus
Name	Koala
Status	Vulnerable
Status system	IUCN3.1
Genus	Phascolarctos
Species	cinereus
Authority	(Goldfuss, 1817)

Phascolarctos cinereus

Phascolarctos cinereus is a marsupial native to eastern and southeastern Australia, commonly known as the koala. It is recognized for its arboreal lifestyle, specialized folivory on eucalypt foliage, and distinctive morphology adapted to life in the canopy. The species has been the subject of extensive research by institutions and researchers concerned with conservation, veterinary medicine, and Australian natural history.

Taxonomy and Evolution

Phascolarctos cinereus was described by Christian Heinrich Friedrich Goldfuss in 1817 and assigned to the genus Phascolarctos within the family Phascolarctidae. Fossil evidence from sites associated with the Pleistocene and Miocene has informed phylogenetic hypotheses linking the species to extinct relatives recovered near the Murray River and in deposits studied by teams from the Australian Museum and the Queensland Museum. Molecular studies using mitochondrial and nuclear markers have been conducted by laboratories at the University of Sydney, Australian National University, and the Commonwealth Scientific and Industrial Research Organisation to resolve divergence times relative to other marsupials such as representatives found in collections at the Natural History Museum, London and the Smithsonian Institution. Paleontological analyses referencing the Riversleigh and Naracoorte fossil sites situate Phascolarctos lineage evolution amid climatic shifts documented in stratigraphic records curated by the Geological Society of Australia.

Description and Anatomy

Adults of Phascolarctos cinereus exhibit sexual dimorphism documented in surveys by the Australian Wildlife Conservancy and veterinarians at the Royal Society for the Prevention of Cruelty to Animals Australia. Average body mass and pelage coloration vary across populations examined by researchers at the University of Melbourne and the University of Queensland. Cranial morphology, dental formulae, and forelimb musculoskeletal adaptations have been detailed in comparative studies referencing specimens from the Macquarie University collections and described in monographs used by the Australian Museum. The gastrointestinal tract shows specialized fermentation chambers adapted to detoxify secondary compounds in eucalypt leaves; these physiological traits have been the focus of research collaborations with the CSIRO and the Commonwealth Department of Agriculture. Sensory and auditory anatomy, including characteristics of the tympanic bulla, have been reported in clinical work at the Taronga Zoo and in publications associated with the Royal Zoological Society of NSW.

Distribution and Habitat

Phascolarctos cinereus occupies a range spanning the states of Queensland, New South Wales, Victoria (Australia), and South Australia with historical records from regions cataloged by the Atlas of Living Australia and survey programs run by the Department of Agriculture, Water and the Environment (Australia). Habitat associations include temperate, subtropical, and sclerophyll woodlands dominated by genera such as Eucalyptus species catalogued in herbarium collections at the Royal Botanic Gardens, Kew and the Royal Botanic Gardens Victoria. Population mapping and fragmentation analyses have been performed by organizations like the IUCN and the World Wildlife Fund Australia, while local land management practices affecting habitat connectivity are overseen by agencies including the New South Wales National Parks and Wildlife Service and the Victorian Department of Environment, Land, Water and Planning.

Behavior and Ecology

Field studies of Phascolarctos cinereus conducted by teams from the University of New South Wales and the University of Tasmania describe a largely solitary, nocturnal species with activity patterns influenced by temperature and food availability monitored in long-term projects funded by the Australian Research Council. Diets dominated by Eucalyptus foliage involve selective feeding behavior characterized in research involving the Botanical Gardens and State Herbarium and collaborative studies with the CSIRO. Social interactions, vocalizations, and territory use have been observed in reserves managed by the National Parks and Wildlife Service (Queensland) and documented in behavioral ecology publications from the Zoological Society of London conferences. Predation pressures historically included marsupial predators represented in faunal lists held by the Museum Victoria; contemporary threats include domestic dogs and vehicle collisions reported in incident databases maintained by the Royal Society for the Prevention of Cruelty to Animals Australia.

Reproduction and Life Cycle

Reproductive biology of Phascolarctos cinereus has been characterized in captive breeding programs at the Taronga Zoo, Lone Pine Koala Sanctuary, and research facilities associated with the University of Melbourne. Mating seasons, pouch development, and lactation dynamics have been studied by veterinarians and reproductive biologists at the Royal Zoological Society of NSW and in collaborative projects with the Australian National University. Juvenile dispersal, growth rates, and survivorship curves are tracked in longitudinal monitoring initiatives coordinated by the Australian Wildlife Conservancy and regional wildlife rescue groups such as the Koala Hospital Port Macquarie. Immunological and disease investigations relevant to reproductive success have been undertaken by researchers at the University of Sydney and the Murdoch University veterinary faculty.

Conservation and Threats

Phascolarctos cinereus is listed as Vulnerable on the IUCN Red List, with conservation assessments and recovery plans developed by the Australian Government Department of Agriculture, Water and the Environment (DAWE) and state agencies including the New South Wales Department of Planning and Environment. Major threats include habitat loss from urban expansion in municipalities documented by the Australian Bureau of Statistics, bushfire impacts exemplified by the 2019–20 Australian bushfire season, and disease pressures addressed by public health collaborations with the Commonwealth Scientific and Industrial Research Organisation and veterinary services at institutions like the Royal Society for the Prevention of Cruelty to Animals Australia. Conservation responses involve protected area management by the National Parks and Wildlife Service (New South Wales), translocation and genetic monitoring overseen by researchers at the University of Adelaide, and policy initiatives debated in forums convened by the Parliament of Australia and environmental NGOs such as the World Wildlife Fund Australia.

Category:Mammals of Australia