What are some overseas groups I could volunteer with to help wildlife?

I'm currently a zoology major. I'm looking for organizations overseas that would allow me to be a part in their mission helping wildlife, as well as gain knowledge of different cultures. I have already looked into the peace corps, cheetah conservation fund, and profauna. I'm just looking for some more ideas, volunteer or internships. I'm interested in many species including marine life. Thanks for any suggestions, and especially comments if you've been in one of the organizations.