Answer: Koala bears
Textured ridges on the fingertips or fingerprints are a common feature of primates. People, chimpanzees and gorillas have them all. It could be said that fingerprints differ from the primate family, except for their presence on koala bears, these adorable Australian marsupials.
Even more interesting is that among all the other animals with fingerprints the koala bear has the most similar fingerprints to those of humans. In fact, so similar that they are indistinguishable under the eyes of a trained forensic scientist or even an electron microscope. The photo above shows a comparison of fingerprints of humans and koala bears, both in standard form and under an electron microscope. The comparison courtesy of researcher Macie Hennenberg shows an adult male koala bear on the left and an adult male on the right.
What fascinates the fingerprints of koala bears is that they seem relatively new. evolutionary adaptation. While members of the primate family have fingerprints, other members of the marsupial family (to which the koala bear belongs) have no fingerprints. This indicates that koala bears have developed fingerprints long after primates and the marsupial ancestors of the modern koala bear collapsed 70 million years ago. Like primates whose hands and digits are adapted to grasp, the koala bear spends much of its time grappling with very sensitive and handy fingertips, prints, and everything.