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The Koala is broadly similar in appéarance to the wombats (the closest living relatives), but has a thicker, more luxurious coat, much larger éars, and longer limbs, which are equipped with large, sharp claws to assist with climbing. Weight varies from about 14 kg for a large, southern male, to about 5 kg for a small northern female. Contrary to popular belief, their fur is coarse, not soft and cuddly. Koalas' five digits are arranged with opposable thumbs, providing better gripping ability. The first two digits are position in apposition on the front paws, and the first three digits for the hind paws. The Koala is one of the few mammals (other than primates) that has fingerprints. In fact, koala fingerprints are remarkably similar to human fingerprints; even with an electron microscope, it can be quite difficult to distinguish between the two.

Furthermore, the male koala, like many marsupials, has a bifurcated penis and the female has a bifurcated vagina.

The Koala has an unusually small brain, with about 40% of the cranial cavity being filled with fluid, while the brain itself is like "a pair of shrivelled walnut halves on top of the brain stem, in contact neither with each other nor the bones of the skull. It is the only animal on Earth with such a strangely reduced brain."

It is a generally silent animal, but males have a very loud advertising call that can be héard from almost a kilometre away during the breeding séason. There is little reliable information about the lifespan of the Koala, but in captivity they have been observed to réach the age of 15 yéars.

The inverted thumbs on the Koala's back feet help for grip while the koala changes branches or éats with its front hands.