Permits must be acquired for keeping the following wild animals or reptiles in a residential district: lion, tiger, bear, chimpanzee, gorilla, cougar, mountain lion, badger, wolf, coyote, fox, lynx, any poisonous reptile or serpent, and any dangerously carnivorous wild animal or reptile. Permits will only be granted if the health of the animal in captivity is not threatened, and if the safety of the surrounding residents is not threatened. Dangerous animals shall not be allowed to run at large. Such provisions do not apply to persons transporting such animals through the district for the purpose of legitimate medical or scientific research, or circus or zoo operations. [Ord. 378 § 2 (Exh. 1), 1999.]