O
obscura, Merula, [549]
obscurior, Cinnyris, [656]
obscurum, Dicæum, [636]
obscurus, Turdus, [549]
occipitalis, Hypothymis, [451], [733]
Leucotreron, [37], [726]
Muscicapa, [451]
Phabotreron, [34]
Phapitreron, [34]
Ptilopus, [37]
Ramphiculus, [37]
occularis, Rhinomyias, [470]
Oceanodroma, [84]
species, [84]
ocellata, Turnix, [20]
ocellatus, Oriolus, [20]
ochotensis, Sylvia (Locustella), [568]
Locustella, [568]
ochropus, Helodromas, [123], [727]
Ochthodromus, [105]
geoffroyi, [106], [727]
mongolus, [107]
veredus, [108], [727]
ocrophus, Tringa, [123]
ocularis, Motacilla, [664]
Rhinomyias, [470], [734]
Œdicnemi, [154]
Œdicnemidæ, [154]
Œdicnemus magnirostris, [154]
œnanthe, Motacilla, [565]
Saxicola, [565]
œnochlamys, Callisitta, [610]
Dendrophila, [610]
Sitta, [610]
olivacea, Abrornis, [474]
Amaurornis, [75]
Cryptolopha, [474], [734]
Gallinua, [75]
olivaceus, Prionochilus, [639]
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]
Orycerca everetti, [691]
oryzivora, Loxia, [688]
Munia, [688]
Padda, [688]
Osmotreron, [26]
axillaris, [27], [28], [725]
everetti, [28]
vernans, [28], [725]
Osprey, Australian, [246]
European, [245]
Otomela, [596]
cristata, [598]
lucionensis, [597]
superciliosa, [598]
Otus, [252]
boholensis, [260]
calayensis, [258]
cuyensis, [257]
everetti, [253]
fuliginosus, [254]
longicornis, [255]
megalotis, [252]
mindorensis, [256]
romblonis, [259]
rufescens, [256]
sibutuensis, [254]
steerei, [729]
whiteheadi, [256]
Owl, Bohol Screech, [260]
Calayan Screech, [258]
Cuming’s Screech, [252]
Cuyo Screech, [257]
Everett’s Hawk, [265]
Everett’s Screech, [253]
Grass, [271]
Gurney’s Horned, [250]
Japanese Hawk, [263]
Long-horned Screech, [255]
Luzon Horned, [250]
Mindanao Horned, [251]
Mindoro Hawk, [268]
Mindoro Screech, [256]
Palawan Barred, [270]
Palawan Screech, [254]
Philippine Hawk, [264]
Platen’s Hawk, [268]
Raffles’s Hawk, [262]
Rey’s Hawk, [267]
Romblon Screech, [259]
Rufous Screech, [256]
Sibutu Screech, [254]
Spotted Hawk, [266]
Tickell’s Hawk, [261]
Tumindao Screech, [729]
Tweeddale’s Hawk, [266]
Whitehead’s Screech, [256]
Oxycerca jagori, [690]