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The spoon-shaped plate on top of the beak is only on the breeding adults. According to the National Geographic Field Guide to Birds of North America, the plate is shed after the eggs are laid.
The American white pelican is a very large bird. It is roughly 62 inches long, with a wingspan of 108 inches. Put another way, it is 5 feet, 2 inches long, and has a wingspan of 9 feet!