Koala | Appearance, Diet, Habitat, & Facts | Britannica

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• What do koalas eat?

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External Websites

• Animal Diversity Web - Koala
• Smithsonian Libraries and Archives - DSpace Repository - Anatomy and development of the Koala, Phascolarcto cinereus: an evolutionary perspective on the superfamily Vombatoidea (PDF)
• Queensland Government - Department of Environment and Science - Koala
• ABC listen - Big Ideas - Saving the koala
• National Center for Biotechnology Information - PubMed Central - Koala reproduction and the implications for human research
• Live Science - Koalas: Facts About Iconic Marsupials
• A-Z Animals - Koala
• San Diego Zoo Animals and Plants - Koala
• Animal Corner - Koala

Britannica Websites Articles from Britannica Encyclopedias for elementary and high school students.

• koala - Children's Encyclopedia (Ages 8-11)
• koala - Student Encyclopedia (Ages 11 and up)

Ask Anything Also known as: Phascolarctos cinereus, koala bear Written and fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors Last updated Mar. 10, 2026 •History Contents Ask Anything

Top Questions

Is a koala a bear?

Though sometimes called a koala bear, the koala is not a bear. The koala is actually a type of tree-dwelling marsupial, with a backwards-facing pouch, like wombats.

How long do koalas live?

Koalas can live to about 15 years of age in the wild and somewhat longer in captivity.

Where are koalas found?

Koalas are found in eastern Australia. Their habitats require the eucalyptus trees on which they feed and in which they live.

What do koalas eat?

Koalas eat the leaves of certain eucalyptus trees. A koala can digest as much as 1.3 kg (3 pounds) of leaves daily, and it has an intestinal pouch about 2 metres (7 feet) long, where symbiotic bacteria degrade the tannins and other toxic and complex substances abundant in eucalyptus. This diet is relatively poor in nutrients.

Are koalas an endangered species?

Koalas are considered a vulnerable species. Their population was decimated from hunting for their fur during the 1900s, and koalas are still in danger from human encroachment upon and destruction of their habitats as well as disease. Chlamydia, which infects many koala populations, makes the female koalas infertile.

News •

Koalas survived a devastating population crash and their DNA is bouncing back • Mar. 6, 2026, 7:19 PM ET (ScienceDaily) ...(Show more) Koalas show unexpected signs of genetic recovery • Mar. 6, 2026, 9:00 AM ET (Earth.com) Show less

koala, (Phascolarctos cinereus), tree-dwelling marsupial of coastal eastern and southern Australia classified in the family Phascolarctidae (suborder Vombatiformes). Due to the animal’s superficial resemblance to a small bear, the koala is sometimes referred to, albeit erroneously, as the koala bear.

The koala is about 60 to 85 cm (24 to 33 inches) long and weighs up to 14 kg (31 pounds) in the southern part of its range (Victoria and South Australia) but only about half that in subtropical Queensland to the north. Virtually tailless, the body is stout and gray, with a pale yellow or cream-coloured chest and mottling on the rump. The broad face has a wide, rounded, leathery nose, small yellow eyes, and big fluffy ears. The feet are strong and clawed; the two inner digits of the front feet and the innermost digit of the hind feet are opposable for grasping.

The koala feeds very selectively on the leaves of certain eucalyptus trees. Generally solitary, individuals move within a home range of more than a dozen trees, one of which is favoured over the others. If koalas become too numerous in a restricted area, they defoliate preferred food trees and, unable to subsist on even closely related species, decline rapidly. To aid in digesting as much as 1.3 kg (3 pounds) of leaves daily, the koala has an intestinal pouch (cecum) about 2 metres (7 feet) long, where symbiotic bacteria degrade the tannins and other toxic and complex substances abundant in eucalyptus. This diet is relatively poor in nutrients and provides the koala little spare energy, so the animal spends long hours simply sitting or sleeping in tree forks, exposed to the elements but insulated by thick fur. Although placid most of the time, koalas produce loud, hollow grunts.

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The koala is the only member of the family Phascolarctidae. Unlike those of other arboreal marsupials, its pouch opens rearward. Births are single, occurring after a gestation of 34 to 36 days. The youngster (called a joey) first puts its head out of the pouch at about five months of age. For up to six weeks it is weaned on a soupy predigested eucalyptus called pap that is lapped directly from the mother’s anus. Pap is derived from the cecum. After weaning, the joey emerges completely from the pouch and clings to the mother’s back until it is nearly a year old. A koala can live to about 15 years of age in the wild, somewhat longer in captivity.

Studies suggest that there are five distinct populations of koalas, which began to diverge from one another sometime between 300,000 and 430,000 years ago. Formerly killed in huge numbers for their fur, especially during the 1920s and ’30s, koalas dwindled in number from several million to a few hundred thousand, which substantially reduced the species’s genetic diversity and that of four of the five individual populations, making the species susceptible to inbreeding. In the southern part of their range, koalas became practically extinct, except for a single genetically diverse population in Gippsland, Victoria. Some were translocated onto small offshore islands, especially Phillip Island, where they did so well that these koalas were used to restock much of the original range in Victoria and southern New South Wales. During the same period, some koalas were also introduced to Kangaroo Island, and later (during the 1950s and ’60s) additional animals were introduced to several other coastal habitats in South Australia. Though once again widespread, koala populations and subpopulations are now scattered and separated by urban areas and farmland, which makes them locally vulnerable to extinction. Another problem is the infection of many populations with Chlamydia, which makes the females infertile.

Also called: koala bear (Show more) Related Topics: charismatic megafauna What Are Baby Koalas Called? Are Koalas Aggressive? (Show more) See all related content

The International Union for Conservation of Nature and Natural Resources (IUCN) has listed the koala as a vulnerable species since 2016. The species decreased in number by nearly 28 percent between the years 1984 and 2012, largely because of habitat loss and fragmentation, which made the animal more susceptible to vehicle strikes and predation by dogs. Devastating drought and bushfires during the late 2010s also contributed to the decline in the number of koalas, reducing the total by an additional 30 percent between 2018 and 2021. Some 60,000 koalas were killed or injured during the “Black Summer” (the Australian bushfire season of 2019–2020) alone. As temperatures increase and the drying effects of climate change become more pronounced in Australia, wildlife officials expect that the number of koalas will decline further in the coming decades.

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Encyclopaedia Britannica.