- Chlidonias niger Black Tern
- Chloebia gouldiae Gouldian Finch
- Chloris chloris Common Greenfinch
- Chroicocephalus bulleri Black-billed Gull
- Chroicocephalus hartlaubii Hartlaub’s Gull
- Chroicocephalus maculipennis Brown-hooded Gull
- Chroicocephalus novaehollandiae Silver Gull
- Chroicocephalus ridibundus Black-headed Gull
- Ciconia ciconia White Stork
- Cincloramphus cruralis Brown Songlark
- Cincloramphus mathewsi Rufous Songlark
- Cincloramphus timoriensis Tawny Grassbird
- Cinclosoma alisteri Nullarbor Quail-thrush
- Cinclosoma castaneothorax Chestnut-breasted Quail-thrush
- Cinclosoma castanotum Chestnut Quail-thrush
- Cinclosoma cinnamomeum Cinnamon Quail-thrush
- Cinclosoma clarum Copperback Quail-thrush
- Cinclosoma marginatum Western Quail-thrush
- Cinclosoma punctatum Spotted Quail-thrush
- Cinnyris frenatus Olive-backed Sunbird
- Circus approximans Swamp Harrier
- Circus assimilis Spotted Harrier
- Circus spilonotus Eastern Marsh Harrier
- Cissomela pectoralis Banded Honeyeater
- Cisticola exilis Golden-headed Cisticola
- Cisticola juncidis Zitting Cisticola
- Cladorhynchus leucocephalus Banded Stilt
- Clamator coromandus Chestnut-winged Cuckoo
- Climacteris affinis White-browed Treecreeper
- Climacteris erythrops Red-browed Treecreeper
- Climacteris melanurus Black-tailed Treecreeper
- Climacteris picumnus Brown Treecreeper
- Climacteris rufus Rufous Treecreeper
- Coenocorypha aucklandica Subantarctic Snipe
- Coenocorypha barrierensis North Island Snipe
- Coenocorypha huegeli Snares Snipe
- Coenocorypha iredalei South Island Snipe
- Coenocorypha pusilla Chatham Islands Snipe
- Collocalia esculenta Glossy Swiftlet
- Collocalia natalis Christmas Island Glossy Swiftlet
- Colluricincla boweri Bower’s Shrike-thrush
- Colluricincla harmonica Grey Shrike-thrush
- Colluricincla megarhyncha Little Shrike-thrush
- Colluricincla woodwardi Sandstone Shrike-thrush
- Columba leucomela White-headed Pigeon
- Columba livia Rock Dove
- Columba vitiensis Metallic Pigeon
- Conopophila albogularis Rufous-banded Honeyeater
- Conopophila rufogularis Rufous-throated Honeyeater
- Conopophila whitei Grey Honeyeater
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