American White Pelican - synchronized feeding

Took this photo at Mallard Point, Fish Creek Park, on 22 September 2015, during a three hour birding walk. When we reached the bridge over the river, we saw this group of American White Pelicans feeding. I had never seen them feeding in this way, but apparently they perform a synchronized effort to find fish. In this photo, tails and wings are all up and the heads are in the water. A few seconds later, every bird was upright and mostly turned in the same direction. Fascinating to watch. Unfortunately, they were very distant, so this is a fully zoomed and cropped image.