act as the functional units of the respiratory system by passing oxygen into the body and carbon dioxide out of the body. Finally, the muscles of respiration, including the diaphragm and intercostal muscles, work together to act as a pump, pushing air into and out of the lungs during breathing.
The Ivory-billed Woodpecker (Campephilus principalis) is an extremely rare member of the woodpecker family, Picidae. It is officially listed as an endangered species, but by the end of the 20th century had widely been considered extinct until it was apparently sighted along the Cache River in Arkansas in 2004 and 2005.
The Ivory-billed Woodpecker is very similar to the larger and very closely related Imperial Woodpecker of Mexico. The Imperial Woodpecker, the largest woodpecker in the world, lacked the white neck stripes and had a longer, thinner crest. It was a bird of mature pine forests, and also is likely extinct.