Koalas are often called “koala bears” – this is not correct. The Koala is not a bear but a marsupial. The closest relative of koala is a wombat, which also has cute and cuddly appearance, but it’s never called a “wombat bear”

Queensland scientists are using mobile phones to unlock the mystery of why koalas bellow.
The distinctive deep grunts and belows of the male Koalas sound in Australian forests in spring, but researchers still don’t understand what they mean.
Noises from koalas on St Bees Island off the coast of Mackay, in central Queensland, are now being relayed [...]

The Koala is one of the few mammals 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.
As shown by Henneberg & als from the Department of Anatomical Sciences, University of Adelaide, koalas have very human-like fingerprints. [...]