(from the article `swallow`) ...worldwide in migration; an American species, called barn swallow, may summer in Canada and winter in Argentina. The 10 species of Petrochelidon, ... Found on http://www.britannica.com/eb/a-z/c/97
any of several North American birds of the genus Hirundo, esp. H. pyrrhonota, that live colonially and build bottle-shaped mud nests on cliffs and walls. Found on https://www.infoplease.com/dictionary/cliff-swallow