This is a cooperative feeding technique seen often in Northern Shovelers. The unusual thing about this group is the size. I counted more than a hundred in this group. Usually, I have seen one to six Northern Shovelers foraging in a whirling circle like this. They stir up the water and the food so that they can feed more easily. This group is really stirring up the water. This was at San Joaquin Wildlife Sanctuary in Irvine, California.

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