The March of Mankind
It is really a battle against ourselves - can we prevent ourselves from taking over everything natural, or will we continue to encroach on the animal's land, finding one day how to train these rhino to push an elevator button and go to sleep in their 21st floor condo? Anyway, I really liked this picture because of the contrast of natural vs man made, free vs confined, horizontal vs vertical, etc. And this is only in Nairobi Kenya - we are way past this pretty much everywhere in the developed world. BTW, this is the Black Rhino, a critically endangered species in Kenya.