Przewalski's-type wild horses appear in European cave art dating as far back as 20,000 years ago, but genetic investigation of a 35,870-year-old specimen from one such cave instead showed affinity with extinct Iberian horse lineage and the modern domestic horse, suggesting that it was not Przewalski's horse being depicted in this art. The earliest demonstrated examples of Przewalski's horses are found in the archaeological sites of the Chalcolithic Botai culture. Archaeological sites dating from the mid-fourth-millennium BCE show evidence of horse domestication, and analysis of ancient DNA of Botai horse specimens from about 3000 BCE reveal them to have been Przewalski's horses.