▁Bomb us ▁v os nes ens ki i ▁is ▁not ▁experien cing ▁a ▁population ▁decl ine ; ▁it ▁is ▁amongst ▁the ▁most ▁common ▁be e ▁species ▁on ▁the ▁West ▁Coast ▁of ▁the ▁United ▁States , ▁and ▁the ▁most ▁common ▁b umble ▁be e ▁from ▁Oregon ▁north ward . ▁The ▁nest ing ▁distribution ▁ranges ▁from ▁British ▁Columbia ▁to ▁B aja ▁California . ▁Histor ically , ▁Bomb us ▁occident alis , ▁the ▁so - called ▁" western ▁b umble ▁be e " ▁was ▁the ▁most ▁common ▁species , ▁with ▁a ▁distribution ▁all ▁the ▁way ▁from ▁California ▁to ▁British ▁Columbia ▁and ▁Al aska , ▁but ▁dise ases ▁introduced ▁by ▁commercial ▁re aring ▁operations ▁in ▁the ▁eastern ▁United ▁States ▁brought ▁B . ▁occident all is ▁to ▁the ▁br ink ▁of ▁ext inction , ▁and ▁B . ▁v os nes ens ki i ▁has ▁filled ▁the ▁gap . ▁B . ▁v os nes ens ki i ' s ▁success ▁in ▁the ▁vac u um ▁left ▁by ▁B . ▁occident alis ▁has ▁not ▁been ▁the ▁perfect ▁story ▁of ▁nature ▁finding ▁balance ▁after ▁disturb ance , ▁however ; ▁in ▁the ▁San ▁Francisco ▁area , ▁the ▁frequency ▁of ▁B . ▁v os nes ens ki i ▁appearances ▁to ▁in vers ely ▁correlate ▁with ▁the ▁species ▁rich ness ▁of ▁be es ▁in ▁the ▁area , ▁indicating ▁that ▁B . ▁v os nes ens ki i ▁out comp etes ▁other ▁be e ▁species ▁for ▁space ▁and ▁resources . ▁This ▁may ▁be ▁due ▁to ▁the ▁species ' ▁early ▁emer gence ▁during ▁the ▁season ,