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American White Pelican
American white pelican eating a fish
Glass and Nature / Shutterstock
Pelicans have truly amazing bills. With a pouch of skin, called a throat sac, connected to the lower mandible to act as a net, they are able to catch fish and filter out the water. What's interesting about the American white pelican is that during breeding season, it makes its bill extra flashy. These pelicans grow a "horn" on the upper bill, which is shed after they lay their eggs. It's the only pelican species to grow such an appendage.