Northern puffback 
Northern red bishop 
Northern rough-winged swallow 
Northern schiffornis 
Northern slaty antshrike 
Northern tufted flycatcher 
Northern waterthrush 
Northern wheatear 
Northern white-crowned shrike 
Northern white-crowned tapaculo 
Northern white-fringed antwren 
Northern yellow white-eye 
Northwestern crow 
Oceanic flycatcher 
Ocellated antbird 
Ocellated tapaculo 
Ocellated woodcreeper 
Ochraceous-breasted flycatcher 
Ochre-bellied flycatcher 
Ochre-breasted antpitta 
Ochre-breasted Tanager 
Ochre-collared Monarch 
Ochre-faced tody-flycatcher 
Ochre-fronted antpitta