What is the difference between a duck and a pelican?

Ducks are waterfowl belonging to the family Anatidae, characterized by their relatively small size, short legs, and broad, flat bills. Pelicans, on the other hand, are large water birds belonging to the family Pelecanidae, known for their long bills with a large throat pouch used for catching fish. In summary, the main differences lie in their size, bill shape, and feeding behaviors.