Because the regulation of exotic animals is left to states, some organizations, including The Humane Society of the United States, advocate for federal, standardized legislation that would ban owning large cats, bears, primates, and large poisonous snakes as pets. In Maine, a permit is required to own most wild birds or animals. Several species are not allowed, however: bear, moose, wild turkey, deer, lion, cheetah, wolf, monkey, camel, alligator, monk parakeet, and swan. But the emu, domestic ferret, sugar glider, and chinchilla are allowed without a permit.