Since we share these distinctive marks with our primate
cousins, it's quite likely that fingerprints first evolved with our common
ancestor several million years ago. But that isn't the case with koalas, who
are alone among all marsupials in having these prints.
And it's not just that our 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