"If a given proto-language was spoken in an area outside that of its daughter languages, specific words designating features of the ancient habitat are not usually preserved in the attested languages. Therefore, if a language ancestral to a group of European languages originated in Africa, we would not be able to find in the extant lexical stock ancient words for "giraffe" and "elephant" which could suggest its African origin. (Dolgopolsky 1987, 8)"