Related Clues:

• Utterings among pen pals?
• Chorus from a pen
• Quick shots
• Laughs through the nose
• High-pitched pig noises
• Hog calls
• Hog dialogue
• Sounds from a bullpen
• Emulates bulls
• Sows' sounds
• Sty chorus
• Research institution in Atlanta
• Sounds from the bullpen
• Piggy noises
• Sounds of sows