It looks like a face, with a mouth ready to chomp down on the unsuspecting photographer. That black square in the middle is the nose, the tube it's gullet, and it has two sharp teeth on top and several broken ones on the bottom. Nature is so very strange, sometimes.
If you've ever wanted to make a difference but found it hard to believe that one person could... check out the Kiva Team Caedes discussion thread and discover that anything is possible.
-Nik