Related Clues:

• Alpaca group
• Source of a thundering sound
• Pol. letters
• Gp. symbolized by an elephant
• Specter's org.
• Crowd
• Cattle that all have the same brand
• Org. that's in the red?
• Moving stock
• Round up
• Driven animal group
• Stampede group, maybe
• Savanna group
• 50-Across's party
• Bison bunch