Collective Animal Names - O
- Otter: BEVY of otter
- Otter: FAMILY of otter
- Otter: RAFT of otter
- Otter: ROMP of otter
- Owls: PARLIAMENT of owls
- Oxen: DROVE of oxen
- Oxen: HERD of oxen
- Oxen: SPAN of oxen
- Oxen: TEAM of oxen
- Oxen: YOKE of oxen
- Oysters: BED of oysters