I would imagine that a permit would be pretty hard to obtain. Surely you would need good reason. Perhaps if something is endangered, you may be able to get a permit to take a couple to try and breed them in captivity to help there numbers out. Even then you would probably have to prove that you have the knowledge and know how to breed them!!!!
Im pretty sure they wouldnt issue permits for people to take animals from the wild for resale. Thats my guess anyway.
I know in the hunting circles, ALL native animals are off limits, and so they should be, unless you have a permit. Most introduced animals are regarded as vermin and predate on our natives, and need to be removed/killed which is why you dont need a permit for them, like fox's, wild cats, rabbits (which destroy habitat), wild dogs etc...etc...