Blue-capped tanager 
Blue-faced Honeyeater 
Blue-faced parrotfinch 
Blue-fronted redstart 
Blue-gray Gnatcatcher 
Blue-gray tanager 
Blue-grey robin 
Blue-headed vireo 
Blue-lored antbird 
Blue-naped Chlorophonia 
Blue-necked tanager 
Blue-shouldered robin-chat 
Blue-throated brown sunbird 
Blue-winged Leafbird 
Blue-winged minla 
Blue-winged mountain tanager 
Blue-winged Pitta 
Blue-winged warbler 
Bluethroat 
Bluish flowerpiercer 
Bluish-gray Saltator 
Bluish-slate antshrike 
Blyths paradise flycatcher 
Boat-billed flycatcher