Interesting article by an elephant researcher in Namibia about the ostracizing of a young elephant and offspring from the family groups in times of resource shortage. Elephants it seems have this in common with humans also.
http://scientistatwork.blogs.nytimes.com/2012/07/27/the-darker-side-of-elephant-country/?ref=science
http://scientistatwork.blogs.nytimes.com/2012/07/27/the-darker-side-of-elephant-country/?ref=science