What license is required to shoot legal ground squirrels and rock chucks?
I'm glad you mention LEGAL ground squirrels and rock chucks. Idaho does have ground squirrels that cannot be hunted, see page 48 of our 2014 and 2015 Upland Bame, Furbearer & Turkey Seasons and Rules.
You need a hunting license to hunt any of the wildlife in the Idaho. If you are a nonresident ther is a Nongame Hunting license availabel at a reduced price that can be used to hunt ground squirrels and marmots.
It is unlawful to take any wildlife without a valid hunting license, or without required tags or permit in possession.
No tag or permit is required to hunt ground squirrels or marmots. Please pay attention to where you are hunting and make sure you have permission to hunt on private land.