Add Yahoo as a preferred source to see more of our stories on Google. Some behaviors are instinctive and others have to be learned. This is as true for people as it is for the other members of the ...

1. Introduction and methods -- Introduction -- Acknowledgments -- The country -- Taxonomy -- History of the discovery and study of the mountain gorilla -- Procedure and methods -- 2. Distribution and ...

Some behaviors are instinctive and others have to be learned. This is as true for people as it is for the other members of the animal kingdom. Perhaps you, like me, may have thought until this moment ...