▁g . ▁bre w ster i , ▁which ▁bre eds ▁from ▁southern ▁Id aho , ▁Wy oming , ▁and ▁Mont ana ▁to ▁south - central ▁O ax aca . ▁These ▁two ▁sub species ▁winter ▁in ▁Mexico . ▁The ▁sw ain son i ▁group ▁also ▁includes ▁V . ▁g . ▁vict oria e , ▁an ▁isolated ▁population ▁bre eding ▁in ▁the ▁Sierra ▁de ▁la ▁Lag una , ▁B aja ▁California ▁Sur , ▁and ▁migr ating ▁to ▁unknown ▁winter ing ▁grounds . ▁ ▁The ▁eastern ▁war bling ▁v ire o , ▁V . ▁g il v us , ▁bre eds ▁from ▁central ▁Al berta ▁and ▁northern ▁Mont ana ▁east ▁and ▁south ▁through ▁most ▁of ▁the ▁United ▁States ▁and ▁parts ▁of ▁southern ▁Canada , ▁outside ▁the ▁range ▁of ▁the ▁previous ▁group . ▁It ▁winter s ▁south ▁of ▁the ▁Ist hm us ▁of ▁Te hu ante pec ▁from ▁south - central ▁Ch ia pas ▁to ▁Nic ar agua . ▁It ▁comple tes ▁its ▁aut umn ▁molt ▁on ▁the ▁bre eding ▁grounds , ▁while ▁the ▁sw ain son ii ▁group ▁comple tes ▁it ▁after ▁leaving . ▁ ▁The ▁brown - c apped ▁v ire o ▁( V ire o ▁le uc oph rys ), ▁resident ▁in ▁Central ▁America ▁and ▁northern ▁South ▁America , ▁is ▁sometimes ▁considered ▁cons pec ific ▁with ▁the ▁war bling ▁v ire o . ▁ ▁Notes ▁ ▁References ▁ ▁F oster , ▁Mer cedes ▁S . ▁( 2 0 0 7 ): ▁The ▁potential ▁of ▁fruit ing ▁trees ▁to ▁enh ance ▁converted ▁habit ats ▁for