▁the ▁Cass ia ▁cross b ill ▁res ides ▁in ▁equ ates ▁to ▁about ▁ 6 7   km ². ▁They ▁are ▁almost ▁exclus ively ▁found ▁in ▁m ature ▁and ▁old - g row th ▁l odge pole ▁p ine ▁domin ated ▁for ests ▁that ▁do ▁not ▁have ▁Red ▁S qu ir rel s ▁as ▁their ▁be ak ▁is ▁adapted ▁for ▁a ▁specific ▁type ▁of ▁p ine ▁cone . ▁This ▁has ▁led ▁to ▁a ▁co e volution ary ▁arms ▁race ▁with ▁the ▁l odge pole ▁p ine , ▁which ▁explains ▁why ▁they ▁are ▁conf ined ▁in ▁such ▁a ▁small ▁area . ▁Other ▁Red ▁Cross b ill ▁call ▁types , ▁typically ▁call ▁type ▁ 2 ▁& ▁ 5 , ▁are ▁also ▁found ▁in ▁these ▁areas , ▁but ▁s eld om ly ▁bre ed ▁here ▁due ▁to ▁being ▁poor ly ▁adapted ▁to ▁the ▁p ine ▁cone ▁structure . ▁Due ▁to ▁their ▁restricted ▁range ▁and ▁habitat , ▁there ▁is ▁a ▁cause ▁for ▁concern ▁for ▁this ▁species ▁surv ival . ▁ ▁Tax onomy ▁The ▁Cass ia ▁cross b ill ▁( L ox ia ▁s ines ci ur is ) ▁was ▁first ▁described ▁in ▁ 2 0 0 9 ▁as ▁the ▁South ▁Hills ▁cross b ill , ▁but ▁The ▁American ▁Or n ith olog ists ' ▁Union ▁( A OU ) ▁failed ▁to ▁find ▁cons ensus ▁on ▁the ▁issue ▁of ▁splitting ▁the ▁species ▁from ▁the ▁red ▁cross b ill ▁in ▁ 2 0 0 9 . ▁The ▁genus ▁“ L ox ia ” ▁means ▁cross wise , ▁while ▁“