While this is not something I've ever done for FREE at Walt Disney World, I have found this information on several web sites and in The Unofficial Guide Walt Disney World, 2015 book. Throughout Asia and Africa at Animal Kingdom, you can find cast members who will discuss their native countries and the wildlife found there if you ask. You can find these ambassadors on the Pangani Forest Exploration Trail, the Maharajah Jungle Trek, and at The Oasis. I've also found that the African Goodwill Ambassadors can be found at the Animal Kingdom Lodge and may also have trading cards with information about their native country.
For parents who are taking children out of school for a trip to Walt Disney World, locating these individuals would be an excellent educational opportunity for the students! I'd much rather learn about an African country from a person who lives there rather than my teacher at school! :)