Work at a wildlife resort

Currently I am a highschool student in Serbia and nex year i want to go to veterinary school. Here, veterinary studies last six years and during that i want to volunteer at some vet hospitals. After vet school i need one year to get my licence. How and where can i apply to work at wildlife resorts (preferably somewhere in South America), if that is even possible. I'm guessing that my Serbian licence would not be applicable outside of my country. What do I do about that too?

Honestly, any experience of work at a wildlife resort that someone could share would be immensely helpful!