Waders or shorebirds are birds of the order Charadriiformes commonly found along shorelines and mudflats that wade in order to forage for food (such as insects or crustaceans) in the mud or sand. The term "wader" is used in much of the world, while "shorebird" is used in North America, where "wader" may be used instead to refer to long-legged wading birds such as storks and herons.