* Freeze: They might freeze in place, hoping to avoid being noticed.
* Whistle: Groundhogs emit a high-pitched whistle as a warning signal, alerting other groundhogs to danger.
* Run: They'll quickly dart into their burrows or seek refuge in thick vegetation.
* Dig: They might frantically dig into the ground to escape a perceived threat.
* Stand on hind legs: This behavior is often used to get a better view of the situation and assess the danger.
* Bite: If cornered, groundhogs can bite defensively.
* Release a foul odor: They have scent glands that release a strong, unpleasant odor to deter predators.
The specific behavior depends on the groundhog's temperament, the perceived threat, and the surrounding environment.