A couple of ravens flew above me in repeated circles when a hawk flew into the area. It seemed as if they were trying to confuse him with their double aerial acrobatics.
Taken with a Canon EOS 7D with an 18-200mm Canon lens near Lake Isabella, California, USA. With minimal processing to adjust for contrast, and conversion to black and white and sepia accomplished in Photoshop CS5.
Same shot but with layers added that I shot with the same camera and lens: