Storks are large, long-legged, long-necked wading birds with long, stout bills. They belong to the family called Ciconiidae, and make up the order Ciconiiformes /sɪˈkoʊni.ɪfɔːrmiːz/. Ciconiiformes previously included a number of other families, such as herons and ibises, but those families have been moved to other orders. Various terms are used to refer to groups of storks, two frequently used ones being a muster of storks and a phalanx of storks. Storks' large size, serial monogamy, and faithfulness to an established nesting site contribute to their prominence in mythology and culture.