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.
Elephas maximus. Asian elephants, smaller than their African cousins, are highly endangered. The subspecies shown here is found only on Borneo and faces threats from the conversion of their forest habitat to agricultural use.lephas maximus. Asian elephants, smaller than their African cousins, are highly endangered. The subspecies shown here is found only on Borneo and faces threats from the conversion of their forest habitat to agricultural use.