Keel (bird anatomy) keel; and ratites (from "ratis", "raft" — referring to the flatness of the sternum), having a subtle keel structure or lacking one entirely. However, this classification has fallen into disuse as evolutionary studies have shown that many flightless birds have evolved from flighted birds. The current definition of Carinatae now includes all extant birds. Keel (bird anatomy) A keel or carina (plural carinae) in bird anatomy is an extension of the sternum (breastbone) which runs axially along the midline of the sternum and extends outward, perpendicular to the plane of the ribs. The keel provides an anchor to which a
Scientific University of the South Campus Villa. For transportation of students inside the campus, the university provides bicycles. The former Hall A was equipped, remodeled and re-inaugurated in 2013 as "Fernando Cabieses Molina" Research Hall. The building stands as the mainstay of scientific production in the university. Besides several research and teaching laboratories, it has an anatomy amphitheater. The library offers its services in two campuses. The Main Library, which is settled in Campus Villa 1, contains most of the collection and resources. The library settled in the “Casona“, in Miraflores District, Lima, has a smaller collection, though, it may request books and other resources