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This image provided by Max Planck Institute for Evolutionary Anthropology shows an artist’s illustration of ancient humans from Ranis, Germany and the Czech Republic traveling together 45,000 years ago.(Tom Björklund/Max Planck Institute for Evolutionary Anthropology via AP)

This image provided by Max Planck Institute for Evolutionary Anthropology shows an artist’s illustration of ancient humans from Ranis, Germany and the Czech Republic traveling together 45,000 years ago.(Tom Björklund/Max Planck Institute for Evolutionary Anthropology via AP)

This image provided by National Museum, Prague shows the skull of an ancient human called Zlatý kůň, originally discovered in the Koněprusy caves of the Czech Republic. (Marek Jantač/National Museum, Prague via AP)

This image provided by National Museum, Prague shows the skull of an ancient human called Zlatý kůň, originally discovered in the Koněprusy caves of the Czech Republic. (Marek Jantač/National Museum, Prague via AP)

This image provided by Max Planck Institute for Evolutionary Anthropology shows an artist’s illustration of an ancient human that scientists call Zlatý kůň, whose skull was found in the Czech Republic..(Tom Björklund/Max Planck Institute for Evolutionary Anthropology via AP)

This image provided by Max Planck Institute for Evolutionary Anthropology shows an artist’s illustration of an ancient human that scientists call Zlatý kůň, whose skull was found in the Czech Republic..(Tom Björklund/Max Planck Institute for Evolutionary Anthropology via AP)

This image provided by National Museum, Prague shows the skull of an ancient human called Zlatý kůň, originally discovered in the Koněprusy caves of the Czech Republic. (Marek Jantač/National Museum, Prague via AP)

This image provided by National Museum, Prague shows the skull of an ancient human called Zlatý kůň, originally discovered in the Koněprusy caves of the Czech Republic. (Marek Jantač/National Museum, Prague via AP)