True, but they aren't exactly small game either (at least in this state), they have their own rules. For one, they require a separate license.they arent big game
I think the minimum caliber in Colorado is .22WMR, but I would check the regs before I used one. Seems my son and I had this conversation before about using my .17 HMR on turkey, and decided it wouldn't meet the required energy minimums.