What state do you live in? There are a number of websites you might stumble upon googling around that list all states' laws, but are rarely updated. If your state has a Department of Natural Resources(DNR) or similar department, I would give them a call or check their website.
i depends on where you live and what you want to keep, some places you need permits for native and exotic some places you dont need permits for anything. where do you live ? here is a site that may help ya