Even though humans are known to be known closely related to chimps, gorillas and monkeys, koala bears have identical fingerprints to the former.
It's not just that human fingerprints are roughly similar to koalas - they really are identical. A trained expert would have trouble telling human and koala fingerprints apart, even using a microscope. You can see a comparison of koala and human fingerprints on the left. While the two look quite similar in the larger view, it's under the even higher resolution of an electron microscope that they really look pretty much indistinguishable.
Source: http://io9.com/5798400/koalas-have-exactly-the-same-fingerprints-as-humans
Verification: http://naturalscience.com/ns/articles/01-04/ns_hll.html
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