Pelicans
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American White Pelican (Pelecanus ervthrorhynchos) with bill pouch extended. Henry's Lake, Idaho May 2009. The horny protuberance on the bill is on both male and female during the mating season and drops off eggs are laid. Scientists think it is an aggressive relief mechanism. Over 90% of hits from other Pelicans are to this protuberance where no harm can be done.
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