This is a map which shows the savannas at Animal Kingdom Lodge:
https://allears.net/wp-content/uploads/archive/acc/ResortMaps/animal-kingdom-lodge-map.pdf
As PP said, you need to know if your reservation is for Jambo House or Kidani Village. That part is not a request; it's like booking at different hotels.
If you want to be able to see giraffes when you look out the window, you need to know which savannas have giraffes. IIRC, the Pembe savanna does not have giraffes.
Giraffes are kept in the barns when the weather gets too cold. If this is a high school graduation trip, then I'm guessing cold weather will not be a problem.
If you rented points, then you cannot make a room request yourself by calling. The Member who made the reservation would need to contact DVC to make the request for you.
If you have a Touring Plans paid subscription, I believe you can use their service to make a room request even though you rented points.