* "Whistle pig" is mainly used in the northeastern United States. This is because groundhogs are known for their loud, high-pitched whistles, which they use for communication.
* Other regions may have different names. For example, in some parts of the country, they're called "woodchuck."
* Technically, the scientific name for a groundhog is "Marmota monax." So while "whistle pig" is a fun nickname, it's not the official name.
So, while "whistle pig" is a popular and accurate nickname for a groundhog in some areas, it's not a universally accepted term.