* Whistle: A high-pitched whistle is often used to alert other groundhogs to danger.
* Chuckle: A low, guttural chuckle is often used to express contentment or relaxation.
* Bark: A short, sharp bark is often used to warn other groundhogs away from food or territory.
* Scream: A loud, piercing scream is often used when a groundhog is in pain or distress.
* Chirp: A soft, high-pitched chirp is often used by young groundhogs to communicate with their parents.