White pelicans are large birds, one of the largest found in North America. Their diet consists mainly of fish which they catch by dipping their beak into the water as they swim across the surface. The bottom portion of the beak expands allowing them to capture a large volume of water. They then sift out the water and swallow the remaining fish and aquatic invertebrates. Often groups of white pelicans will hunt cooperatively swimming in circles to round the fish up.