There are two species of pelicans in North America, and one of those is the Brown Pelican, Pelecanus occidentalis, an endangered species that was almost obliterated by pollution from a pesticide plant that was dumping directly into the Pacific ocean in southern California, back in the 1970s. Apparently, huge amounts of DDT was dumped directly into the sea where it entered the food chain and by the time pelicans ate their dinner, the amount of DDT was so great, that with additional meals, the pelicans were so affected, they no longer could raise chicks, as the chicks never even made it out of the egg, the shells were so thin.
Fortunately, that pollution ceased, DDT was banned, and the brown pelicans slowly recovered. They are, however, still on the endangered species list.

A visit to the coast of California brings the site of lots of pelicans nowadays. They are large ponderous birds, sitting about 2 1/2 feet tall, with massive bills and a uniqueness about them that is very different from other birds, due in part to their size, but mainly their posture, and the way they hold their heads and that massive, pouched bill.
They are coastal birds, they live right along the shore, flying out to sea a few miles in search of fish to eat. They catch fish by diving into the water and grabbing the fish in their bills, with the weight of their huge bodies knocking the fish. They then tip their head and bill to the side, allowing water to drain out, then tip back their head and swallow the fish whole.

While visiting a wharf on a bay, a fishing boat came in and as the fish were being cleaned, pelicans and sea gulls swarmed the dock, looking for handouts. Dozens of pelicans and hundreds of sea gulls seemed to be living on the rooftops of buildings and decks of boats all over that small harbor. A few were busy fighting over the entrails tossed into the water as fish were cleaned. In the last image, the pelican has such a handout in its bill.