solitary vireo may refer to: * cassin's vireo, vireo cassinii, endemic west of the rocky mountains from southwestern canada to california, united states * plumbeous vireo, vireo plumbeus, endemic east of the rocky mountains from southwestern montana, united states to western mexico * blue-headed vireo, vireo solitarius proper, endemic to canada east of the rocky mountains to northeastern united states 
Birds_by_common_name Vireo_(genus)