▁par v ipes ▁( C ass in , ▁ 1 8 5 2 ) ▁ ▁The ▁dist in ctions ▁between ▁the ▁two ▁ge ese ▁have ▁led ▁to ▁confusion ▁and ▁debate ▁among ▁orn ith olog ists . ▁This ▁has ▁been ▁ag gra v ated ▁by ▁the ▁overlap ▁between ▁the ▁small ▁types ▁of ▁Canada ▁go ose ▁and ▁larger ▁types ▁of ▁c ack ling ▁go ose . ▁The ▁old ▁" less er ▁Canada ▁ge ese " ▁were ▁believed ▁to ▁be ▁a ▁partly ▁hy brid ▁population , ▁with ▁the ▁birds ▁named ▁B . ▁c . ▁ta ver ner i ▁considered ▁a ▁mixture ▁of ▁B . ▁c . ▁min ima , ▁B . ▁c . ▁occident alis , ▁and ▁B . ▁c . ▁par v ipes . ▁The ▁hol ot ype ▁spec imen ▁of ▁ta ver ner i ▁is ▁a ▁straightforward ▁large ▁pale ▁c ack ling ▁go ose ▁however , ▁and ▁hence ▁the ▁tax on ▁is ▁still ▁valid ▁today ▁and ▁was ▁renamed ▁" T aver ner ' s ▁c ack ling ▁go ose ". ▁ ▁In ▁addition , ▁the ▁bar n acle ▁go ose ▁( B . ▁le uc opsis ) ▁was ▁determined ▁to ▁be ▁a ▁derivative ▁of ▁the ▁c ack ling ▁go ose ▁line age , ▁whereas ▁the ▁Hawai ian ▁go ose ▁( B . ▁sand vic ensis ) ▁origin ated ▁from ▁ancest ral ▁Canada ▁ge ese . ▁Thus , ▁the ▁species ' ▁distinct ness ▁is ▁well ▁ev iden ced . ▁A ▁recent ▁proposed ▁revision ▁by ▁Harold ▁C . ▁Hans on ▁suggests ▁splitting ▁Canada ▁and ▁c ack