Yes, you certainly can shoot rockchucks and ground squirrels. There is a protected rockchuck in our state, but it is only found on the Olympic Peninsula. Pretty much any chuck East of the Cascades is fair game. As far as squirrels go, blast away! The only squirrel that is protected is some species of tree squirrel - the western gray tree squirrel, I believe the regs say. Any ground nesting rodent is fair game as well. As far as the bunnies and their worms go, I have no idea. I just know they are around and shootable Sept. 1st. If you plan on eating them, it may be best to do as your dad told you. However, if you are ridding someone of a pest animal by shooting the rabbits, worms is no reason to keep you from shooting them - as long as they are in season. Now, if you know of a good rockchuck or ground squirrel colony that needs some thinning out, you just let me know, and I would love to help!
Loki