The koala is famous for fingerprints remarkably similar to human fingerprints.
Koala fingerprints contain arches, loops, and whorls, the same broad pattern types found in humans. Their ridges are so similar that a koala print can be difficult to distinguish from a human print without careful examination. This resemblance evolved independently rather than through close evolutionary relatedness.
The fingerprints are associated with the koala’s grasping lifestyle. Koalas use their hands to grip branches and manipulate eucalyptus leaves, so friction ridges may improve control while climbing and feeding.
The similarity is a case of convergent evolution: unrelated animals can develop comparable features when facing similar mechanical demands. Chimpanzees and some other primates also have fingerprints, but the koala is especially well known for this human-like pattern among zoo mammals.