Which animal has fingerprints like humans?
Quick answer
Koalas have fingerprints that are remarkably similar to human fingerprints, with the same kinds of loops, whorls and arches. A 1996 Australian study found they can be hard to tell apart even under a microscope. Koalas evolved them independently from us, probably for gripping branches and handling leaves.
A case of convergent evolution
Humans and koalas aren’t closely related. Our last common ancestor lived over 100 million years ago. Most of the koala’s relatives, such as kangaroos and wombats, don’t have fingerprints. This means koalas evolved theirs separately, an example of convergent evolution, when unrelated species develop similar features to solve similar problems.
Why have fingerprints at all?
Scientists still debate the exact purpose. Leading ideas:
| Idea | How it might help |
|---|---|
| Grip | Ridges help hold onto surfaces, especially when slightly moist |
| Touch | Ridges amplify vibrations, improving the sense of touch and texture |
| Handling food | Koalas carefully pick the eucalyptus leaves they eat |
Could koala prints confuse police?
The 1996 study at the University of Adelaide raised this possibility half-jokingly. In practice, koalas rarely visit crime scenes, and their palms and hand shape are very different from ours.
Other animals with fingerprints
| Animal | Notes |
|---|---|
| Chimpanzees | Fingerprints, like other great apes |
| Gorillas | Fingerprints and unique “nose prints” used by researchers |
| Orangutans | Fingerprints |
| Koalas | The only well-known non-primate with human-like prints |
Koala facts
- Koalas are marsupials, not bears; babies (joeys) develop in a pouch.
- They sleep 18–22 hours a day, partly because eucalyptus leaves provide little energy.
- They have two thumbs on each front paw, helping them grip branches.
Every human print is unique
No two people, not even identical twins, have been found to share the same fingerprints. Prints form in the womb by about the 17th week of pregnancy.
For another unusual mammal, see which mammal can fly.
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