This morning all I could hear was a horrible banging sound, it was jarring and startling all at once.  I realized that it was the birds again.  I had already taken this picture one day when the birds had been disturbed by a predator somewhere in the rooftops.  I looked out my window and I could just see the outline of webbed feet through the curled plastic roof over the terrace and a dark form that looked like it was losing its shape.  Again, the thumping sound and this time I saw what was happening- the webbed feet would hold position and then move slowly while the dark shape seemed to move in a thumping process thrown by the bird.  It was again the dance of predator and prey and I could do nothing, but accept that this was part of our existence, where one being feasted on another.  It was shocking, even as seen as just shapes through the muted plastic, but it was also something that communicated an acceptance of the natural order of things.