| an echo of (cave-dwelling) | Oilbirds |
| a gaggle of | Old squaws |
| a pitch of | Orioles |
| a split of | Orioles |
| a harvest of (orchard) | Orioles |
| a duet of | Osprey |
| a flock of | Ostriches |
| a pride of | Ostriches |
| a wobble of | Ostriches |
| a stew of | Ovenbirds |
| a (Teacher! Teacher! Teacher!) of | Ovenbirds |
| a brood of | Owlets |
| a bazaar of | Owls |
| a brood of | Owls |
| a diss of | Owls |
| an eyrie of | Owls |
| a glaring of | Owls |
| a hooting of | Owls |
| a looming of | Owls |
| a nest of | Owls |
| a pair of | Owls |
| a parliament of | Owls |
| a sagaciousness of | Owls |
| a silence of (when in flight) | Owls |
| a stare of | Owls |
| a stooping of | Owls |
| a wisdom of | Owls |
| a stable of (barn) | Owls |
| a jail of (barred) | Owls |
| a prohibition of (barred) | Owls |
| a schizpphrenia of (Hawk) | Owls |
| a volery of (little) | Owls |
| a parliment of (long-eared) | Owls |
| a blizzard of (snowy) | Owls |
| a fling of | Oxbirds |
| a parcel of | Oystercatchers |
| a Rockerfeller of | Oystercatchers |
| a stew of | Oystercatchers |
Additions to this list are welcome, especially Australian and New Zealand birds. EMAIL: narena@nzbirds.com
NZ Birds uses antique print images to illustrate our site. For the purposes of this page, we would be pleased to receive photographs of birds from around the world to illustrate some of the collective nouns. Please EMAIL: jaclyn@nzbirds.com if you wish to contribute.