The UN airlifted these guys into the nature reserve so they can coalesce into a group that can survive when released back into the wild. This action is to prevent them from being eaten or poached in the meantime. (Sounds like these guys were orphaned as a result of bushmeat and illegal trafficking activities.)
Frankly, with the rate these poor animals are being decimated, I wonder sometimes if they SHOULD be released back into the wild. Wouldn't they be safer in the reserve?