Kozarnika or Peshtera Kozarnika is a cave in northwestern Bulgaria that was used as a hunters’ shelter as early as the Lower Paleolithic. It marks an older route of early human migration from Africa to Europe via the Balkans, prior to the other currently suggested route - the one across Gibraltar. The cave probably keeps the earliest evidence of human s…Kozarnika or Peshtera Kozarnika is a cave in northwestern Bulgaria that was used as a hunters’ shelter as early as the Lower Paleolithic. It marks an older route of early human migration from Africa to Europe via the Balkans, prior to the other currently suggested route - the one across Gibraltar. The cave probably keeps the earliest evidence of human symbolic behaviour and the earliest European Gravette flint assemblages came to light here.