Graceful swimmers, pelicans feast almost entirely on fish. Their bright orange bills can measure up to a foot long, and they use them to pluck fish right out of the water. Pelicans often work in groups, like synchronized swimmers, when trying to catch a meal. By crowding around fish, pelicans can corral them closer to shore (and shallow water), where the birds scoop them up and eat them. 
~First animal sighted in Yellowstone just outside the Elk preserve.  I did not know there were pellicans in Yellowstone... but I do now.
See photo in original gallery.