Four King Penguins in a Mating Ritual March

I followed this group four penguins for over nearly two hours as they wandered among hundreds of other King Penguins. They would march for a few minutes and then stop and form a tight circle. Periodically, one of them would slap another smartly with its wing, and after a time they would march off again. I put this image in the "Digital Composite/Illustration" category becuase I deepened the blue of the sky.