Onopopelia humilis, [56]
Oreocichla varia, [554]
orientalis, Acrocephalus, [571]
Coracias, [302]
Eurystomus, [302], [730]
Glareola, [152]
Salicaria turdina, [571]
origenis, Collocalia, [353]
Oriole, Basilan, [699]
Black-headed, [701]
Cebu, [700]
Grant’s, [697]
Gray-cheeked, [700]
Philippine, [695]
Samar, [698]
Steere’s, [698]
White-lored, [697]
Oriolidæ, [693]
Oriolus, [694]
acrorhynchus, [695]
albiloris, [697]
assimilis, [700]
basilanicus, [699]
chinensis, [695]
cinereogenys, [700]
isabellæ, [697]
lineatus, [12]
nigrostriatus, [698]
ocellatus, [20]
palawanensis, [695]
samarensis, [698]
sinensis, [711]
steeri, [698], [699]
suluensis, [695]
xanthonotus, [701]
Orthorhamphus, [143]
magnirostris, [154], [728]
Orthotomus, [572]
castaneiceps, [574]
chloronotus, [575]
cineraceus, [576]
cinereiceps, [577]
derbianus, [575]
frontalis, [573], [574]
mearnsi, [574]
nigriceps, [578]
panayensis, [574]
ruficeps, [576]
samarensis, [578]