Zookeeper Internship at Zoo Atlanta (Biol 4695): Only offered in the fall. Coordinated by Dr. Linda Green. Email her for more details and application to the internship.
Experimental Analysis of Behavior (Psych 3031): If you are permit restricted for the class, just email the professor, Dr. Marr. Tell him about your interest/qualifications for the course, and he will most likely give you a permit. The class is usually very small, so he loves when new people show interest. The BEST PART? The corresponding lab is at ZOO ATLANTA! Where you will have the opportunity to train goats and sheep! You pick a behavior, and then each week work with your designated animal using operant and classical conditioning, then at the end of the semester there's a show!
Animal Physiology I (Biol 4446): This class is not offered very often, and there are some rumors that it might be discontinued due to other course restructuring, but it is worth checking for.
Look at research labs! Many of the labs at tech use animals for their experiments. Marine researchers work with a varieties of invertebrates. There was even a physics lab that once worked with elephants and snakes at Zoo Atlanta to research the mechanism of defecation. Always feel free to branch out as well. Dr. Joseph Mendelson is an adjunct GT professor who is the Director of Research at Zoo Atlanta. If you contact him, he can put you in touch with researchers you could potentially work under.