This is a Baobab tree. Can store an enormous amount of water. What's funny are the comments on http://imgur.com/gallery/o3wLu "But it sits over the richest deposit of unobtanium on the planet. Obviously we have to blow it up and start strip-mining" & "Yeah, your mom used the "retaining water" excuse, too" etc
RESEARCH: I really like this piece. The trees in the background has the perfect mood that doesn't conflict with the rest of the image. The light to dark notion is truly great. The stones in the middle makes this shot work very well.