Keel (bird anatomy) 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 bird's wing muscles attach, thereby providing adequate leverage for flight. Keels do not exist on all birds; in particular, some flightless birds lack a keel structure. Historically, the presence or absence of a pronounced keel structure was used as a broad classification of birds into two orders: Carinatae (from "carina", "keel"), having a pronounced
The Anatomy of the Tongue in Cheek The Anatomy of the Tongue in Cheek The Anatomy of the Tongue in Cheek (often shortened to Anatomy) is the second full-length album released by the Christian rock band Relient K. It was released on August 28, 2001, and peaked at No. 158 on the "Billboard" 200. On June 26, 2006, the album was certified Gold by the RIAA for sales in excess of 500,000 units in the United States. The cover of the original release is similar to that of the 1999 Ramones release "". The album continues the band's liberal use of pop culture references (such as the