The photo was taken by Yulia Serova.
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Modern humans are descended from Neanderthals and Denisovans. The hominins were so similar to us that they interbred with humans for thousands of years. Many people today still carry important genetic material from their cousins.
Neanderthals disappeared from the fossil record 40,000 years ago. There are only a handful of fossils confirmed to be Denisovans, and no complete skeleton, so there is no fossil record for these near-humans.
David Gokhman is a geneticist at the Weizmann Institute of Science in Israel who studies Denisovans and Neanderthals.
Fossil discoveries and DNA analysis give researchers a few clues about how the two hominins differed.
