its an iteresting problem if you have enough time

to be exactly there are a lot of problems and the most importent is communication. if you talk with the natives there is allways a language barrier. do you realy understand what they say? and do you realy understand what they mean? you know what a sabretooth tiger was but the native probably dont know it so you take the term "sabretooth" and label the words of the native with this. what you realy do is to act as if you had the same mind like he have.
karen blixen wrote somewhere that bantu's stop in the development of their consciousness on the level of a 9 years old, somali on the level of a 13 years old. this does not meaning they are not real humans or is a cild of 9 years or an old man of 90 not a human like you and me.
this watching was the explanation of the colonial age when the western civilisation had to care for the young and underdevelopt people in the today third world.

something to think about it

http://www.youtube.com/watch?v=lOxuRIfFs0w

http://www.youtube.com/watch?v=A9-UXLy2hY8