Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Kupfuura: Munguva yokupedzisira yePleistocene epoch, pakati pamakore 240 000 ne220 000 akapfuura, steppe wisent (B. priscus) yakatamira ichibva kuSiberia ichienda kuAlaska ichiyambuka Bering Land Bridge. Bison priscus yaigara kuchamhembe kweNorth America munguva yose yePleistocene. Kumadokero kweNorth America, B. priscus yakashanduka ikava bison ine nyanga refu, B. latifrons, iyo yakazova B. antiquus. B. latifrons yakakura inoratidzika kuva yakafa panenge pamakore 20 000 akapfuura. Pashure pokutsakatika kweB. latifrons, B. antiquus yakava yakawanda zvikuru mumativi epakati peNorth America kubva muna 18,000 yapfuura kusvikira munenge muna 10,000 yapfuura, pashure pacho rudzi rwacho runoratidzika kuva rwakabereka rudzi rwuri kurarama, B. bison. B. antiquus ndiyo mhuka hombe inodya zvinomera inowanzotorwa mumigodhi yeLa Brea. B. antiquus yakanga yakareba, iine mapfupa makuru nenyanga, uye yaiva yakakura ne15-25% kupfuura bison yemazuva ano. Yakasvika pakureba 2.27 m (7.5 ft), kureba 4.6 m (15 ft), uye kurema 1,588 kg (3500 lb). Kubva kumugumo kusvika kumugumo, nyanga dzeB. antiquus dzaiva dzakareba mamita anenge 1.  Mubvunzo: Maererano nenhamba yenguva yenyika, nzombe dzomumapani dzakatama riini dzichibva kuSiberia dzichienda kuAlaska?
pakati pemakore 240,000 ne220,000 apfuura