Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Hanyar wucewa: A lokacin ƙarshen zamanin Pleistocene, tsakanin shekaru 240,000 zuwa 220,000 da suka gabata, steppe wisent (B. priscus) ya yi ƙaura daga Siberia zuwa Alaska a kan Bering Land Bridge. Bison priscus ya zauna a arewacin Arewacin Amirka a cikin sauran Pleistocene. A yammacin Arewacin Amurka, B. priscus ya samo asali a cikin dogon bison mai dogon lokaci, B. latifrons, wanda daga baya ya samo asali a cikin B. antiquus. Mafi girma B. latifrons ya bayyana ya mutu da kimanin 20,000 ya. Bayan mutuwar B. latifrons, B. antiquus ya zama mai yawa a sassa na tsakiyar tsakiyar Arewacin Amirka daga 18,000 ya zuwa kimanin 10,000 ya, bayan haka jinsin ya bayyana ya haifar da jinsunan da ke rayuwa, B. bison. B. antiquus shine mafi yawan dawo da manyan dabbobi masu shayarwa daga La Brea tar pits. B. antiquus ya fi tsayi, yana da manyan kasusuwa da ƙaho, kuma ya kasance 15-25% ya fi girma fiye da bison na zamani. Ya kai tsayin 2.27 m (7.5 ft), tsawon 4.6 m (15 ft), da nauyin 1,588 kg (3500 lb). Daga tip zuwa tip, ƙahonin B. antiquus sun auna kusan 3 ft (kusan 1 m).  Tambaya: A wane lokaci ne steppe wisent ya yi ƙaura daga Siberia zuwa Alaska bisa ga ma'aunin lokaci na ƙasa?
tsakanin shekaru 240,000 zuwa 220,000 da suka wuce