Zoology,Herpetology any help?

I will be attending college in the fall and i want to major in zoology and hopefully get internships at zoos so i can be a zookeeper, i want to be a herpetologist (specialize in reptiles ) however i have not found anyplace that offers cles for you to specialize in reptiles. Does anyone know of any colleges that offer the option of taking cles for reptiles? Or anything that i can do to become a herpetologist? i would very much appreciate it if you can offer any help :)